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, General Sales and Gross Receipts Taxes in North Carolina [NCSALESTAX], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/NCSALESTAX/, June 3, 2015.