Year	Percent
1950	15.11916
1955	15.56769
1960	15.47504
1965	15.09802
1970	14.62964
1975	15.2151
1980	14.79608
1985	13.998
1990	13.73028
1995	13.26736
2000	13.81732
2005	15.28916
2010	17.23978
2015	19.43243
2020	21.44692
2025	23.04258
2030	24.3776
2035	25.82289
2040	27.00878
2045	27.81044
2050	28.04473
2055	27.86803
2060	27.32499
2065	26.54472
2070	25.88464
2075	25.19468
2080	24.43189
2085	23.74714
2090	23.20472
2095	22.82784
2100	22.57751