Try this link for the Bureau of Economic Analysis: http://www.bea.gov/national/index.htm

The Federal Reserve databank may also be helpful: http://www.newyorkfed.org/data-and-statistics/

The World Bank also maintain country-by-country database: http://data.worldbank.org/country/united-states

http://www.newyorkfed.org/data-and-statistics/

http://data.worldbank.org/country/united-states

http://www.bea.gov/national/index.htm

You should find what you need at the following link

http://www.federalreserve.gov/econresdata/statisticsdata.htm

Let me also suggest you a very interesting research on this field by John T. Harvey:

https://ideas.repec.org/p/tcu/wpaper/201001.html

Let me also suggest you: http://www.bea.gov/international/