Year	Percent
1950	14.79311
1955	13.41459
1960	16.35918
1965	16.8901
1970	15.71334
1975	15.34362
1980	15.74228
1985	15.89277
1990	16.00138
1995	15.08473
2000	13.78985
2005	12.53734
2010	11.29316
2015	10.57829
2020	9.66158
2025	8.83593
2030	8.02631
2035	7.36391
2040	6.81221
2045	6.37572
2050	6.00309
2055	5.67318
2060	5.39143
2065	5.14632
2070	4.96511
2075	4.82915
2080	4.72836
2085	4.6615
2090	4.60624
2095	4.56504
2100	4.53592