Year	Percent
1950	16.09498
1955	18.49656
1960	18.69563
1965	18.69038
1970	18.75425
1975	18.90092
1980	18.76757
1985	18.25456
1990	17.9698
1995	18.00155
2000	17.90298
2005	16.90155
2010	15.91632
2015	15.04027
2020	14.62178
2025	14.10512
2030	13.44888
2035	12.71893
2040	12.05249
2045	11.48309
2050	10.96497
2055	10.46441
2060	9.95396
2065	9.46893
2070	9.02257
2075	8.59627
2080	8.21114
2085	7.84164
2090	7.48813
2095	7.16733
2100	6.8526