"TABLE 15-6  Total Reported Oil Spills by Source: 1991–2001
",,,,
Mode or source,Percentage of total ,All oil spills (gallons),,
Maritime tank vessels,37.4,"7,245,027",,
Maritime nontank and other vessels,18.5,"3,584,388",,
Maritime facilities,21.8,"4,210,114",,
Pipeline,10.4,"2,003,526",,
"Highway, rail, and other transportation",1.5,"285,191",,
Nontransportation structures and facilities,3.7,"723,172",,
Unknown and other,6.7,"1,299,139",,
Total,100.0,"19,350,557",,
NOTE: Percentages may not add to 100 because of independent rounding.,,,,
"
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, calculations using data in table 15-5.",,,,