Year	Percent
1950	27.24646
1955	27.66679
1960	27.56568
1965	27.89925
1970	28.32598
1975	27.31218
1980	26.49417
1985	25.84428
1990	27.49644
1995	26.91765
2000	26.91682
2005	26.90915
2010	27.83473
2015	29.13295
2020	30.06185
2025	30.80633
2030	31.38824
2035	31.38038
2040	31.41184
2045	31.37556
2050	31.04719
2055	30.88558
2060	30.53673
2065	30.07523
2070	29.55981
2075	29.06505
2080	28.58172
2085	28.09497
2090	27.60004
2095	27.07297
2100	26.52262