How many programmers are there in America?

Question

I have heard anything from 1 in 100 working adults to 1 in 10 working adults -- does anybody have any good data?

UPDATE: Well, I found the answer. About 1 in 200:

800,000 programmers in the US[0].

150,000,000 workers in the US[1].

[0] http://money.cnn.com/magazines/moneymag/bestjobs/2009/snapshots/12.html

[1] http://factfinder.census.gov/servlet/STTable?_bm=y&-geo_id=01000US&-qr_name=ACS_2008_3YR_G00_S2401&-ds_name=ACS_2008_3YR_G00_