United States fact of the day

Percentage of annual net electricity generation by renewables in 1948: 32

Percentage of annual net electricity generation by renewables in 2005: 11

The main difference of course is the fall in the relative import of hydroelectric power.

By the way, those numbers are read off a graph and thus are approximate.  They are from p.67 of Mara Prentiss, Energy Revolution: The Physics and the Promise of Efficient Technology, new and noteworthy from The Belknap Press of Harvard University Press, recommended.