Year	Percent
1950	17.46637
1955	19.62945
1960	19.92981
1965	20.1258
1970	20.19196
1975	20.49597
1980	20.3717
1985	19.96637
1990	18.77597
1995	16.82711
2000	16.98557
2005	16.61453
2010	16.01365
2015	14.57325
2020	13.65291
2025	12.8759
2030	12.20613
2035	11.53551
2040	10.83837
2045	10.16181
2050	9.56749
2055	9.02406
2060	8.52513
2065	8.06073
2070	7.62142
2075	7.19973
2080	6.82864
2085	6.51514
2090	6.23565
2095	5.99261
2100	5.77525