Year	Percent
1950	16.79373
1955	15.67841
1960	14.51891
1965	13.30851
1970	12.93902
1975	12.46818
1980	12.39305
1985	12.34223
1990	13.34626
1995	14.67142
2000	16.03843
2005	18.74548
2010	20.19879
2015	21.66335
2020	21.93286
2025	21.32597
2030	19.98137
2035	21.75794
2040	24.15207
2045	26.43714
2050	28.31142
2055	27.7542
2060	27.04473
2065	26.84248
2070	27.26378
2075	27.35245
2080	27.17022
2085	26.94633
2090	26.77644
2095	26.66092
2100	26.54465