Year	Percent
1950	30.89673
1955	28.22206
1960	25.48409
1965	25.51934
1970	25.35994
1975	27.46279
1980	30.76028
1985	33.65378
1990	32.88436
1995	28.95845
2000	24.37565
2005	24.26602
2010	22.06345
2015	22.46784
2020	24.13458
2025	25.36674
2030	25.73609
2035	25.41895
2040	24.96559
2045	24.59954
2050	24.61049
2055	24.18704
2060	23.569
2065	23.01593
2070	22.59283
2075	22.28635
2080	22.04881
2085	21.80773
2090	21.55843
2095	21.33849
2100	21.18499