Year	Percent
1950	15.85283
1955	16.23141
1960	16.43797
1965	17.17422
1970	17.77406
1975	18.20286
1980	18.64095
1985	19.1474
1990	18.93083
1995	18.11472
2000	17.30866
2005	17.29672
2010	17.15709
2015	16.5379
2020	15.6156
2025	14.76618
2030	14.03915
2035	13.41089
2040	12.78503
2045	12.1945
2050	11.60337
2055	11.0335
2060	10.49915
2065	10.02977
2070	9.60642
2075	9.18657
2080	8.78205
2085	8.39406
2090	8.02929
2095	7.69348
2100	7.38398