Year	Percent
1950	21.26795
1955	21.36985
1960	19.61096
1965	19.80002
1970	20.40604
1975	21.33798
1980	22.55138
1985	21.05958
1990	22.00483
1995	24.15949
2000	27.03579
2005	29.03179
2010	28.32812
2015	27.48221
2020	27.65706
2025	30.01694
2030	31.91804
2035	32.2242
2040	30.22505
2045	26.9216
2050	25.30735
2055	24.42298
2060	24.44087
2065	24.69528
2070	23.81258
2075	22.90846
2080	22.53001
2085	22.71119
2090	23.09133
2095	23.36276
2100	23.27693