This is a bit of good news for our hobby...

I found this posted by George (K3UD) on QRZ.com. He has this broken out nicely there but here is the jist of the article....

Numbers of US population and the number of
hams at the start of each decade from 1930.

Year Population # Hams Growth Rate
1930 123,202,624 - 19,000
1940 132,164,569 - 56,000 +194%
1950 151,325,798 - 87,000 +55%
1960 179,323,175 - 230,000 +164%
1970 203,211,926 - 263,918 +15%
1980 226,545,805 - 393,353 +49%
1990 248,709,873 - 502,677 +28%
2000 281,421,906 - 682,240 +36%
2008 303,000,000 - 658,648 -3.5% (Est. population)
2009 306,684,279 - 671,525 -2.0% (Est. population)

Notice that over the last year, our total population has risen. This bears watching as it still doesn't make up for the reducing in numbers from the year 2000.
I highly recommend looking at the full article on QRZ.com to get the full scope of the picture.