Year	Percent
1950	27.11817
1955	27.09456
1960	26.77527
1965	26.68711
1970	27.91786
1975	29.90666
1980	32.07767
1985	33.19462
1990	34.28719
1995	34.57909
2000	33.9278
2005	31.43335
2010	29.79686
2015	29.65129
2020	28.64605
2025	28.76715
2030	27.82053
2035	25.16264
2040	23.18104
2045	21.38436
2050	20.74913
2055	20.89058
2060	20.94108
2065	20.64733
2070	20.11758
2075	19.72567
2080	19.69616
2085	19.97312
2090	20.31621
2095	20.47437
2100	20.3976