Year	Percent
1950	27.61983
1955	27.02663
1960	25.67805
1965	23.72755
1970	23.0694
1975	23.31121
1980	24.1237
1985	25.26315
1990	26.14907
1995	27.59148
2000	28.63379
2005	30.01764
2010	31.05589
2015	31.23864
2020	31.44154
2025	31.55105
2030	31.84192
2035	32.07507
2040	31.86052
2045	31.43013
2050	30.86057
2055	30.51368
2060	30.13879
2065	29.68091
2070	29.14147
2075	28.56045
2080	27.98639
2085	27.43195
2090	26.8678
2095	26.27288
2100	25.66025