Year	Percent
1950	28.40674
1955	28.28765
1960	28.06682
1965	27.51213
1970	27.19825
1975	27.31189
1980	25.49145
1985	24.72332
1990	25.1252
1995	25.98828
2000	26.69875
2005	28.15171
2010	28.98118
2015	29.42172
2020	29.51799
2025	29.53236
2030	30.07702
2035	30.96034
2040	31.57039
2045	31.76978
2050	31.51146
2055	31.05783
2060	30.81264
2065	30.68401
2070	30.52607
2075	30.23112
2080	29.80166
2085	29.32612
2090	28.87755
2095	28.46736
2100	28.0724