Sources:

Highway, Passenger car and light-truck occupants, Highway non-occupants, Large-truck occupants, U.S. air carriers, General aviation, and Recreational boating - As cited in or calculated from U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics, tables 2-9, 2-14, 2-17, 2-19, 2-21, 2-23, 2-47, and 3-10 available at https://www.bts.gov/nts.

Transit - U.S. Department of Transportation, Federal Transit Administration, NTD Safety & Security Time Series Data, available at https://www.transit.dot.gov/ntd.

Rail - U.S. Department of Transportation, Federal Railroad Administration, table 1.12, available at https://safetydata.fra.dot.gov/.