I was looking at 1820-2008 in Maddison which gives us the 40x increase. Both those numbers are in 1990 dollars, so using your estimate of 20 million after infla

I was looking at 1820-2008 in Maddison which gives us the 40x increase. Both those numbers are in 1990 dollars, so using your estimate of 20 million after inflation 20/36,232 ~= 1000/1,446,959 ignoring all the confounding coffee stains on the back of the napkin.