Year	Percent
1950	10.88861
1955	17.15114
1960	19.2376
1965	19.4968
1970	18.06701
1975	17.25518
1980	16.65912
1985	17.64511
1990	18.17543
1995	16.32554
2000	14.6339
2005	12.77884
2010	13.4127
2015	13.91687
2020	13.02436
2025	11.77533
2030	10.73356
2035	10.2788
2040	10.15087
2045	9.87512
2050	9.27335
2055	8.57906
2060	8.03965
2065	7.72195
2070	7.48232
2075	7.19149
2080	6.80731
2085	6.43817
2090	6.14502
2095	5.9454
2100	5.78915