Year	Percent
1950	17.78146
1955	16.95637
1960	16.13811
1965	15.48069
1970	15.13413
1975	15.20142
1980	15.46623
1985	16.35115
1990	17.3048
1995	19.24736
2000	21.52862
2005	23.5935
2010	25.42473
2015	26.07617
2020	26.1378
2025	26.25829
2030	26.73641
2035	27.33125
2040	27.65627
2045	27.3261
2050	26.45514
2055	25.53569
2060	24.93285
2065	24.57398
2070	24.19254
2075	23.9114
2080	23.61605
2085	23.34617
2090	23.11517
2095	22.94846
2100	22.81578