Year	Percent
1950	13.04728
1955	13.35377
1960	14.14302
1965	14.32822
1970	14.59896
1975	14.37936
1980	13.65722
1985	13.43829
1990	12.46008
1995	12.03487
2000	11.39541
2005	10.20516
2010	9.52763
2015	9.06092
2020	8.78683
2025	8.19245
2030	7.60174
2035	7.07264
2040	6.64329
2045	6.30659
2050	6.02982
2055	5.76561
2060	5.51053
2065	5.29147
2070	5.11955
2075	4.98926
2080	4.88772
2085	4.80097
2090	4.72102
2095	4.64735
2100	4.59236