Year	Percent
1950	17.46933
1955	19.60265
1960	19.03667
1965	18.33318
1970	18.15071
1975	18.29209
1980	18.48097
1985	18.08652
1990	17.05376
1995	16.97629
2000	16.26641
2005	15.20401
2010	13.31656
2015	12.26911
2020	11.51656
2025	10.73632
2030	9.94123
2035	9.17887
2040	8.50143
2045	7.90884
2050	7.39873
2055	6.95228
2060	6.56448
2065	6.2072
2070	5.90299
2075	5.64257
2080	5.43553
2085	5.2613
2090	5.12017
2095	4.99674
2100	4.88831