For more information, see http://www.census.gov/govs/www/statetax.html.
Source: US. Bureau of the Census
Release: State Government Tax Collections
US. Bureau of the Census, State Government Tax Collections, Documentary and Stock Transfer Taxes in the United States [USDOCUTAX], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/USDOCUTAX/, July 6, 2015.