all , ▁ 6 6 % ▁of ▁the ▁list ▁was ▁self - made , ▁ 1 3 % ▁achieved ▁their ▁wealth ▁through ▁inheritance ▁alone , ▁and ▁ 2 1 % ▁through ▁a ▁mixture ▁of ▁the ▁two . ▁ ▁The ▁combined ▁wealth ▁of ▁the ▁top ▁ 2 0 ▁rose ▁from ▁$ 7 1 4 . 5 ▁billion ▁to ▁$ 8 3 8 . 6 ▁billion . ▁ ▁The ▁United ▁States ▁had ▁ 4 9 2 ▁billion aires ▁on ▁the ▁list , ▁the ▁most ▁of ▁any ▁country . ▁ ▁The ▁country ▁also ▁had ▁the ▁most ▁new com ers ▁with ▁ 5 0 , ▁and ▁women ▁with ▁ 5 4 . ▁ ▁China ▁had ▁the ▁second ▁most ▁billion aires ▁with ▁ 1 5 2 , ▁including ▁ 3 7 ▁new ▁names . ▁ ▁Russia ▁was ▁third ▁with ▁ 1 1 1 . ▁ ▁Al ger ia , ▁Lith u ania , ▁T anz ania , ▁and ▁U g anda ▁were ▁all ▁represented ▁on ▁the ▁list ▁for ▁the ▁first ▁time . ▁ ▁Six teen ▁of ▁the ▁female ▁billion aires ▁came ▁from ▁Germany , ▁the ▁second ▁most ▁of ▁any ▁country . ▁ ▁Turkey ▁saw ▁the ▁most ▁people ▁drop ▁off ▁the ▁list , ▁ 1 9 , ▁due ▁to ▁high ▁infl ation ▁in ▁the ▁country . ▁ ▁Top ▁ 1 0 ▁ ▁Top ▁ 1 0 0 : ▁ ▁See ▁also ▁▁▁ ▁The ▁World ' s ▁Bill ion aires ▁ 2 0 1 3 ▁▁ ▁The ▁World ' s ▁Bill ion aires ▁ 2 0 1 5 ▁ ▁References