Year	Percent
1950	17.38378
1955	17.52618
1960	17.59697
1965	17.71573
1970	17.88038
1975	17.80893
1980	17.02515
1985	17.26754
1990	18.4443
1995	19.21838
2000	20.09441
2005	19.37458
2010	19.10339
2015	18.58903
2020	18.30011
2025	17.70078
2030	16.98636
2035	16.21327
2040	15.4363
2045	14.71691
2050	14.03415
2055	13.33998
2060	12.65656
2065	12.00127
2070	11.4122
2075	10.86569
2080	10.35598
2085	9.87029
2090	9.40726
2095	8.95462
2100	8.55145