Year	Percent
1950	17.42297
1955	17.36808
1960	16.83147
1965	16.06536
1970	14.91551
1975	14.07985
1980	13.06373
1985	11.92422
1990	11.16654
1995	11.31157
2000	11.62878
2005	12.19993
2010	12.8432
2015	13.3729
2020	14.0108
2025	14.58435
2030	15.20731
2035	16.04929
2040	17.12614
2045	18.18002
2050	19.09716
2055	19.77738
2060	20.37526
2065	21.05465
2070	21.74876
2075	22.3923
2080	22.87339
2085	23.24275
2090	23.57089
2095	23.89223
2100	24.17491