US economy - 8 Californias
European Union (and added to it the holdouts in Europe, Switzerland and Norway), plus Canada, Oz and NZ: 10.5 Californias
"Prosperous Asia" (a neat term) - 3.5 Californias
that's Japan, South Korea, Taiwan, Hong Kong and Singapore
China - 3.3 Californias
The rest - 6.7
that's most of SE Asia, BRICs, all of Latin America and the whole of the Islamic world including all the oil.
Fortunes does say the figures are very rough.