Year	Percent
1950	32.10111
1955	29.68915
1960	27.64885
1965	26.77079
1970	26.55814
1975	27.49239
1980	28.23573
1985	27.44697
1990	26.62514
1995	26.00477
2000	26.17466
2005	27.79327
2010	29.34667
2015	30.18109
2020	30.47597
2025	30.34964
2030	30.57447
2035	31.07271
2040	31.58097
2045	31.83103
2050	31.60648
2055	31.16133
2060	30.81672
2065	30.59524
2070	30.42628
2075	30.16032
2080	29.77166
2085	29.33097
2090	28.89793
2095	28.51589
2100	28.13265