Year	Percent
1950	29.09382
1955	28.65302
1960	27.7631
1965	26.57999
1970	25.56105
1975	25.6785
1980	25.52875
1985	25.50848
1990	25.98685
1995	26.14338
2000	26.96716
2005	28.43327
2010	30.12998
2015	31.96457
2020	33.18697
2025	33.79238
2030	33.49416
2035	32.57855
2040	31.52836
2045	30.40942
2050	29.65204
2055	28.83432
2060	27.87085
2065	26.86892
2070	25.92481
2075	25.09196
2080	24.37212
2085	23.73683
2090	23.16888
2095	22.65356
2100	22.19063