Year	Percent
1950	28.49383
1955	33.83779
1960	37.03556
1965	37.92093
1970	35.41588
1975	27.28651
1980	35.54154
1985	35.1077
1990	35.87037
1995	34.95605
2000	36.32217
2005	37.97036
2010	38.20483
2015	37.59456
2020	35.89124
2025	33.82917
2030	32.07261
2035	31.34716
2040	30.96847
2045	30.64671
2050	30.22263
2055	29.28804
2060	28.42725
2065	27.67348
2070	27.07098
2075	26.56775
2080	26.06818
2085	25.52482
2090	24.9684
2095	24.4537
2100	24.03102