In 2000 developing countries accounted for 37% of world output (at purchasing power parities). By 2008, their share rose to 45%. The share of the BRICs leapt from 16% to 22%, a sharp rise in such a short period. Almost 60% of all the increase in world output that occurred in 2000-08 happened in developing countries; half of it took place in the BRICs alone (see chart).

Source: http://www.economist.com/world/international/displaystory.cfm?story_id=E1_TPRSTJGJ

from The Economist print edition 3/20/10