Year	Percent
1950	20.01906
1955	18.86738
1960	19.03703
1965	19.74664
1970	17.87623
1975	14.55494
1980	14.26989
1985	15.26082
1990	14.08994
1995	14.12215
2000	13.53969
2005	13.6123
2010	13.20568
2015	12.16107
2020	11.0918
2025	10.84781
2030	10.89505
2035	10.78944
2040	10.35283
2045	9.61822
2050	8.88541
2055	8.42676
2060	8.267
2065	8.13635
2070	7.84049
2075	7.37436
2080	6.88375
2085	6.51232
2090	6.31638
2095	6.20181
2100	6.0539