Year	Percent
1950	19.27813
1955	17.39057
1960	17.91248
1965	18.60697
1970	19.13751
1975	19.41894
1980	19.61388
1985	19.52612
1990	18.64826
1995	18.51469
2000	18.28523
2005	18.00494
2010	17.94301
2015	16.43298
2020	15.85814
2025	15.16818
2030	14.37223
2035	13.51147
2040	12.70262
2045	11.96051
2050	11.26487
2055	10.63398
2060	10.0398
2065	9.4856
2070	8.96367
2075	8.47752
2080	8.03291
2085	7.62593
2090	7.24495
2095	6.91432
2100	6.6175