Year	Percent
1950	13.15666
1955	13.84208
1960	14.45317
1965	14.34301
1970	14.42322
1975	13.46308
1980	12.60164
1985	12.61721
1990	12.50113
1995	11.30491
2000	10.24281
2005	9.66122
2010	8.61355
2015	7.62413
2020	7.22834
2025	6.74812
2030	6.27903
2035	5.87644
2040	5.56077
2045	5.30875
2050	5.11337
2055	4.97702
2060	4.85705
2065	4.7594
2070	4.6922
2075	4.6515
2080	4.63977
2085	4.64391
2090	4.64826
2095	4.6493
2100	4.65389