Year	Percent
1950	14.64753
1955	15.69146
1960	14.36965
1965	14.76069
1970	16.47535
1975	16.75625
1980	16.30482
1985	16.31422
1990	15.78845
1995	15.98721
2000	16.62422
2005	15.49985
2010	13.85278
2015	13.3781
2020	13.10592
2025	12.67181
2030	11.99504
2035	11.24611
2040	10.58406
2045	10.05764
2050	9.62086
2055	9.19588
2060	8.75095
2065	8.29077
2070	7.87664
2075	7.50328
2080	7.18057
2085	6.87963
2090	6.5934
2095	6.32904
2100	6.08071