Year	Percent
1950	15.47764
1955	19.60784
1960	18.63394
1965	18.04104
1970	17.91115
1975	18.20601
1980	17.42777
1985	17.23269
1990	15.91907
1995	15.09074
2000	13.96139
2005	12.55226
2010	11.57736
2015	11.07313
2020	11.17153
2025	11.0738
2030	10.55608
2035	9.62502
2040	8.60282
2045	7.91412
2050	7.63848
2055	7.52344
2060	7.28747
2065	6.8463
2070	6.3252
2075	5.93982
2080	5.789
2085	5.7908
2090	5.77217
2095	5.62829
2100	5.37653