Source: US. Bureau of Economic Analysis
Source: US. Bureau of the Census
US. Bureau of Economic Analysis and US. Bureau of the Census, U.S. Imports of Services: Government Goods and Services, not included elsewhere [ITMGGSM133S], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/ITMGGSM133S, October 21, 2016.