Year	Percent
1950	27.79866
1955	29.06928
1960	31.88859
1965	31.78504
1970	30.27165
1975	29.53436
1980	28.99871
1985	29.05441
1990	29.10932
1995	28.24017
2000	27.70813
2005	27.92259
2010	28.54306
2015	26.97506
2020	24.3787
2025	22.12032
2030	20.84654
2035	20.71843
2040	22.53009
2045	23.33183
2050	22.39138
2055	21.40385
2060	20.94234
2065	21.14787
2070	21.87934
2075	22.57146
2080	22.62423
2085	22.07142
2090	21.45835
2095	21.2073
2100	21.37507