The 2008 CIA World Factbook

by United States. Central Intelligence Agency

Bolivia
6.5% (31 December 2007)

Botswana
14.5% (31 December 2007)

Brazil
17.85% (31 December 2007)

Bulgaria
4.58% (31 December 2007)

Burkina Faso
4.25% (31 December 2007)

Burma
12% (31 December 2007)

Burundi
10.12% (31 December 2007)

Cambodia
5.25% (31 December 2007)

Canada
4.5% (31 December 2007)

Cape Verde
8.5% (31 December 2007)