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Seasonally Adjusted Transportation Data
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Source:
Public transit ridership - American Public Transportation Association (APTA) data (2000 through 2009) available at: http://www.apta.com/resources/statistics/Pages/ridershipreport.aspx and U.S. Department of Transportation, Federal Transit Administration, National Transit Database (2010 to present) available at: http://www.ntdprogram.gov/ntdprogram/data.htm
Seasonally-adjusted public transit ridership - U.S. Department of Transportation, Bureau of Transportation Statistics (BTS) calculation from American Public Transportation Association (APTA) data (2000 through 2009) available at: http://www.apta.com/resources/statistics/Pages/ridershipreport.aspx and U.S. Department of Transportation, Federal Transit Administration, National Transit Database (2010 to present) available at: http://www.ntdprogram.gov/ntdprogram/data.htm