Year	Percent
1950	23.79977
1955	23.67219
1960	20.54435
1965	19.58378
1970	20.34252
1975	21.82376
1980	23.70767
1985	24.45144
1990	25.2966
1995	27.30484
2000	28.90938
2005	30.43732
2010	31.16559
2015	30.05045
2020	30.07223
2025	29.99312
2030	29.34328
2035	27.67154
2040	24.92269
2045	22.45624
2050	21.548
2055	22.21486
2060	23.25527
2065	24.06367
2070	23.69337
2075	22.85951
2080	22.35647
2085	22.4378
2090	22.88326
2095	23.21855
2100	23.10571