Year	Percent
1950	12.48624
1955	14.05374
1960	15.82697
1965	16.51835
1970	16.19483
1975	15.63241
1980	14.5557
1985	12.6259
1990	12.34798
1995	11.65234
2000	13.22678
2005	12.67037
2010	11.22949
2015	9.71477
2020	9.46867
2025	9.17752
2030	8.7164
2035	8.19945
2040	7.71469
2045	7.3118
2050	7.00993
2055	6.74649
2060	6.49496
2065	6.24697
2070	6.04096
2075	5.88166
2080	5.76317
2085	5.66972
2090	5.58273
2095	5.49076
2100	5.4084