Year	Percent
1950	27.17301
1955	25.76132
1960	25.20154
1965	24.95519
1970	25.21892
1975	27.0283
1980	28.51149
1985	29.87175
1990	30.7717
1995	30.57217
2000	30.42226
2005	30.28462
2010	30.66953
2015	31.24731
2020	31.43387
2025	31.26576
2030	30.96518
2035	30.28397
2040	29.79186
2045	29.51164
2050	29.10086
2055	28.59831
2060	28.02882
2065	27.44797
2070	26.88153
2075	26.32074
2080	25.7613
2085	25.20671
2090	24.65361
2095	24.12647
2100	23.6537