Year	Percent
1950	13.17025
1955	16.82104
1960	17.34127
1965	16.69334
1970	16.13875
1975	14.3918
1980	13.29348
1985	12.36487
1990	11.99682
1995	10.68796
2000	9.28973
2005	9.09767
2010	8.16733
2015	8.57211
2020	7.82829
2025	6.85714
2030	6.39807
2035	6.37686
2040	6.50996
2045	6.51131
2050	6.27212
2055	5.91885
2060	5.66552
2065	5.58669
2070	5.60088
2075	5.57448
2080	5.44425
2085	5.25313
2090	5.09052
2095	5.01475
2100	5.00025