Year	Percent
1950	27.94401
1955	30.40886
1960	33.63808
1965	32.0259
1970	29.84711
1975	29.58187
1980	30.54134
1985	33.15898
1990	32.50477
1995	31.7803
2000	30.9188
2005	31.08715
2010	32.75813
2015	32.25529
2020	29.95605
2025	26.7412
2030	24.23996
2035	24.35315
2040	25.92416
2045	27.09546
2050	26.70772
2055	25.22277
2060	24.24122
2065	24.14394
2070	24.75035
2075	25.33639
2080	25.27361
2085	24.58135
2090	23.79477
2095	23.41818
2100	23.50036