BBC News - New global index exposes 'modern slavery' worldwide

Estimated number of slaves

India - 13,956,010
China - 2,949,243
Pakistan - 2,127,132
Nigeria - 701,032
Ethiopia - 651,110
Russia - 516,217
Thailand - 472,811
DR Congo - 462,327
Burma - 384,037
Bangladesh - 343,19

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