Year	Percent
1950	14.90981
1955	16.38798
1960	15.99099
1965	18.04936
1970	13.67233
1975	18.76931
1980	11.52117
1985	14.22864
1990	9.50633
1995	11.29333
2000	8.29508
2005	7.34554
2010	7.33071
2015	7.21917
2020	6.66533
2025	6.31447
2030	6.17355
2035	6.05581
2040	5.83642
2045	5.57657
2050	5.29832
2055	5.09266
2060	4.93821
2065	4.78296
2070	4.60407
2075	4.40814
2080	4.21758
2085	4.06253
2090	3.97303
2095	3.91061
2100	3.86118