Year	Percent
1950	13.68553
1955	13.91002
1960	14.25908
1965	14.62686
1970	14.71123
1975	14.33059
1980	13.86738
1985	12.92377
1990	12.03887
1995	11.3612
2000	10.66374
2005	10.35052
2010	9.78955
2015	9.4268
2020	9.14469
2025	8.58777
2030	8.1255
2035	7.73707
2040	7.37155
2045	7.02412
2050	6.7156
2055	6.42761
2060	6.16674
2065	5.94396
2070	5.76119
2075	5.59353
2080	5.44843
2085	5.32082
2090	5.20725
2095	5.11054
2100	5.029