Year	Percent
1950	29.67466
1955	27.81967
1960	24.71945
1965	22.34681
1970	22.00109
1975	21.85705
1980	27.24035
1985	30.11263
1990	32.98825
1995	32.00408
2000	31.20435
2005	27.51845
2010	20.6776
2015	20.37027
2020	22.76209
2025	25.712
2030	27.64696
2035	26.88608
2040	24.71745
2045	23.20808
2050	22.91862
2055	23.15485
2060	23.67072
2065	23.50025
2070	22.5057
2075	21.35452
2080	20.69148
2085	20.62404
2090	20.86406
2095	21.00427
2100	20.81677