Year	Percent
1950	29.55176
1955	29.59639
1960	28.68203
1965	26.00025
1970	24.78456
1975	25.79265
1980	27.02528
1985	26.7988
1990	26.82504
1995	27.59318
2000	30.7261
2005	36.49335
2010	39.52622
2015	39.1182
2020	35.78191
2025	30.93005
2030	27.43533
2035	26.71218
2040	26.97035
2045	26.3578
2050	24.23179
2055	21.63864
2060	20.13534
2065	20.07933
2070	20.78962
2075	21.28178
2080	21.04343
2085	20.29894
2090	19.71305
2095	19.70664
2100	20.14836