Year	Percent
1950	23.21715
1955	25.38963
1960	27.22404
1965	27.54663
1970	27.6982
1975	26.23769
1980	23.09817
1985	24.70393
1990	26.49398
1995	31.90152
2000	32.43788
2005	33.29727
2010	32.59014
2015	31.72036
2020	31.46401
2025	30.90934
2030	30.83834
2035	31.16867
2040	31.07209
2045	30.71416
2050	29.97961
2055	29.03393
2060	28.37509
2065	27.85141
2070	27.2958
2075	26.57487
2080	25.72076
2085	24.86539
2090	24.14449
2095	23.59858
2100	23.14894