Year	Percent
1950	27.06381
1955	27.61591
1960	28.22341
1965	28.41061
1970	27.75682
1975	28.1587
1980	29.40338
1985	31.28675
1990	32.37255
1995	28.78036
2000	27.79715
2005	25.47875
2010	26.31729
2015	29.34722
2020	30.77975
2025	29.8342
2030	27.24836
2035	24.7917
2040	22.3104
2045	21.67942
2050	22.10945
2055	21.65558
2060	20.7832
2065	19.72011
2070	18.93198
2075	18.70905
2080	18.96212
2085	19.26705
2090	19.28817
2095	19.06202
2100	18.81913