1992:
India: 0%
China: 0%
U.S: 1.7%
1999:
India: 0.3%
China: 0.7%
U.S: 35.8%
2006:
India: 2.8%
China: 10.5%
U.S: 68.9%
2017:
India: 34.4%
China: 54.3%
U.S: 87.3%
via : World Bank.
1992:
India: 0%
China: 0%
U.S: 1.7%
1999:
India: 0.3%
China: 0.7%
U.S: 35.8%
2006:
India: 2.8%
China: 10.5%
U.S: 68.9%
2017:
India: 34.4%
China: 54.3%
U.S: 87.3%
via : World Bank.