Year	Percent
1950	27.23976
1955	27.13207
1960	26.91992
1965	26.54805
1970	26.21781
1975	26.0027
1980	25.96726
1985	26.33026
1990	27.06715
1995	27.86164
2000	28.14582
2005	28.40385
2010	28.1078
2015	28.53571
2020	29.27906
2025	30.25849
2030	31.10117
2035	31.3195
2040	31.14357
2045	30.86325
2050	30.69497
2055	30.62224
2060	30.49122
2065	30.21114
2070	29.78728
2075	29.31977
2080	28.90296
2085	28.56276
2090	28.24483
2095	27.89732
2100	27.49228