"Lew Hartswick" wrote in message
nk.net...
clay wrote:
any ideas or basis on why the dramatic drop right after 1948?

ca

The way I use to hear it was: It's all that nuclear testing. :-)

No, that's when I was born. And I'm sooooooooooooo kewl.....:-)

--
Jeff
It is preferential to refrain from the utilization of sesquipedalian
verbiage in the circumstance that your intellectualization can be verbalized
using compararatively simplistic lexicographical entitities.