Year	Percent
1950	16.69849
1955	20.36097
1960	19.75004
1965	19.62688
1970	19.50265
1975	20.07058
1980	20.61791
1985	20.29894
1990	20.31345
1995	19.87425
2000	19.49614
2005	19.65619
2010	19.6699
2015	18.94632
2020	18.04692
2025	17.33399
2030	16.69861
2035	16.03171
2040	15.32718
2045	14.59399
2050	13.8721
2055	13.20127
2060	12.58427
2065	12.01595
2070	11.47782
2075	10.9571
2080	10.46932
2085	10.02156
2090	9.59648
2095	9.20059
2100	8.82084