| Total
          U.S.-Canadian border | 
        6,820,052 | 
       
      
        | Total
          top 5 gateways | 
        4,544,669 | 
       
      
        | Detroit,
          MI | 
        1,668,496 | 
       
      
        | Buffalo-Niagara,
          NY | 
        1,208,096 | 
       
      
        | Port
          Huron, MI | 
        907,291 | 
       
      
        | Blaine,
          WA | 
        409,786 | 
       
      
        | Champlain-Rouses
          Point, NY | 
        351,000 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        6,606,307 | 
       
      
        | Total top 5 gateways | 
        4,397,004 | 
       
      
        | Detroit, MI | 
        1,588,769 | 
       
      
        | Buffalo-Niagara, NY | 
        1,162,950 | 
       
      
        | Port Huron, MI | 
        927,740 | 
       
      
        | Champlain-Rouse Pt., NY | 
        378,783 | 
       
      
        | Blaine, WA | 
        338,762 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        6,775,388 | 
       
      
        | Total top 5 gateways | 
        4,520,932 | 
       
      
        | Detroit, MI | 
        1,638,062 | 
       
      
        | Buffalo-Niagara, NY | 
        1,175,884 | 
       
      
        | Port Huron, MI | 
        947,907 | 
       
      
        | Champlain-Rouse Pt., NY | 
        381,434 | 
       
      
        | Blaine, WA | 
        377,645 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        6,775,444 | 
       
      
        | Total top 5 gateways | 
        4,472,799 | 
       
      
        | Detroit, MI | 
        1,678,177 | 
       
      
        | Buffalo-Niagara, NY | 
        1,142,274 | 
       
      
        | Port Huron, MI | 
        924,776 | 
       
      
        | Champlain-Rouse Pt., NY | 
        374,524 | 
       
      
        | Blaine, WA | 
        353,048 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        6,669,623 | 
       
      
        | Total top 5 gateways | 
        4,412,181 | 
       
      
        | Detroit, MI | 
        1,715,969 | 
       
      
        | Buffalo-Niagara, NY | 
        1,118,120 | 
       
      
        | Port Huron, MI | 
        833,711 | 
       
      
        | Champlain-Rouse Pt., NY | 
        391,541 | 
       
      
        | Blaine, WA | 
        352,840 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        6,365,752 | 
       
      
        | Total top 5 gateways | 
        4,306,192 | 
       
      
        | Detroit, MI | 
        1,725,426 | 
       
      
        | Buffalo-Niagara, NY | 
        1,088,469 | 
       
      
        | Port Huron, MI | 
        770,282 | 
       
      
        | Champlain-Rouse Pt., NY | 
        366,059 | 
       
      
        | Blaine, WA | 
        355,956 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        5,782,214 | 
       
      
        | Total top 5 gateways | 
        3,827,225 | 
       
      
        | Detroit, MI | 
        1,482,250 | 
       
      
        | Buffalo-Niagara, NY | 
        981,329 | 
       
      
        | Port Huron, MI | 
        732,493 | 
       
      
        | Champlain-Rouse Pt., NY | 
        356,844 | 
       
      
        | Blaine, WA | 
        274,309 | 
       
        | 
    
      
        
        
       
      
        | Total
          U.S.-Canadian border | 
        4,954,442 | 
       
      
        | Total
          top 5 gateways | 
        3,227,155 | 
       
      
        | Detroit,
          MI | 
        1,153,887 | 
       
      
        | Buffalo-Niagara,
          NY | 
        845,627 | 
       
      
        | Port
          Huron, MI | 
        623,549 | 
       
      
        | Blaine, WA | 
        310,962 | 
       
      
        | Champlain-Rouse
          Pt., NY | 
        293,130 | 
       
        | 
  
  
    
      
        
        
       
      
        | Total
          U.S.-Canadian border | 
        1,824,976 | 
       
      
        | Total
          top 5 gateways | 
        1,305,446 | 
       
      
        | Port
          Huron, MI | 
        424,635 | 
       
      
        | Detroit,
          MI | 
        293,300 | 
       
      
        | International
          Falls, MN | 
        238,515 | 
       
      
        | Portal,
          ND | 
        199,637 | 
       
      
        | Buffalo-Niagara,
          NY | 
        149,359 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        1,868,245 | 
       
      
        | Total top 5 gateways | 
        1,333,244 | 
       
      
        | Port Huron, MI | 
        458,551 | 
       
      
        | Detroit, MI | 
        254,688 | 
       
      
        | International Falls, MN | 
        252,699 | 
       
      
        | Portal, ND | 
        217,390 | 
       
      
        | Buffalo-Niagara, NY | 
        149,916 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        1,950,909 | 
       
      
        | Total top 5 gateways | 
        1,346,724 | 
       
      
        | Port Huron, MI | 
        474,175 | 
       
      
        | International Falls, MN | 
        259,165 | 
       
      
        | Detroit, MI | 
        234,823 | 
       
      
        | Portal, ND | 
        224,896 | 
       
      
        | Buffalo-Niagara, NY | 
        153,665 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        1,940,557 | 
       
      
        | Total top 5 gateways | 
        1,325,479 | 
       
      
        | Port Huron, MI | 
        457,275 | 
       
      
        | International Falls, MN | 
        251,118 | 
       
      
        | Portal, ND | 
        231,832 | 
       
      
        | Detroit, MI | 
        231,482 | 
       
      
        | Buffalo-Niagara, NY | 
        153,772 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        1,923,787 | 
       
      
        | Total top 5 gateways | 
        1,333,105 | 
       
      
        | Port Huron, MI | 
        445,269 | 
       
      
        | International Falls, MN | 
        282,784 | 
       
      
        | Portal, ND | 
        244,988 | 
       
      
        | Detroit, MI | 
        218,963 | 
       
      
        | Buffalo-Niagara, NY | 
        141,101 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        1,939,876 | 
       
      
        | Total top 5 gateways | 
        1,347,207 | 
       
      
        | Port Huron, MI | 
        466,569 | 
       
      
        | International Falls, MN | 
        290,852 | 
       
      
        | Portal, ND | 
        242,220 | 
       
      
        | Detroit, MI | 
        213,777 | 
       
      
        | Buffalo-Niagara, NY | 
        133,789 | 
       
        | 
    
      
        
        
       
      
        | Total U.S.-Canadian border | 
        1,898,581 | 
       
      
        | Total top 5 gateways | 
        1,329,412 | 
       
      
        | Port Huron, MI | 
        426,661 | 
       
      
        | International Falls, MN | 
        335,442 | 
       
      
        | Portal, ND | 
        235,589 | 
       
      
        | Detroit, MI | 
        210,255 | 
       
      
        | Buffalo-Niagara, NY | 
        121,465 | 
       
        | 
    
      
        
        
       
      
        | Total
          U.S.-Canadian border | 
        1,553,416 | 
       
      
        | Total
          top 5 gateways | 
        1,115,410 | 
       
      
        | Port
          Huron, MI | 
        369,321 | 
       
      
        | International
          Falls, MN | 
        295,171 | 
       
      
        | Portal,
          ND | 
        194,884 | 
       
      
        | Detroit,
          MI | 
        155,283 | 
       
      
        | Buffalo-Niagara,
          NY | 
        100,751 | 
       
        |