Year	Percent
1950	16.37687
1955	15.29666
1960	13.89983
1965	13.65431
1970	15.14496
1975	17.25576
1980	20.07095
1985	20.8092
1990	21.0575
1995	22.88729
2000	25.10815
2005	27.00761
2010	27.66951
2015	26.52011
2020	26.02287
2025	26.20482
2030	26.92268
2035	27.61724
2040	27.7351
2045	27.04221
2050	26.88832
2055	26.24495
2060	25.55986
2065	24.9411
2070	24.08814
2075	23.52991
2080	23.25693
2085	23.14442
2090	23.05189
2095	22.93931
2100	22.77783