Year	Percent
1950	12.08131
1955	13.02237
1960	14.87694
1965	14.39698
1970	15.36277
1975	14.54366
1980	11.97439
1985	10.47812
1990	9.66631
1995	9.78475
2000	9.20653
2005	8.32509
2010	8.25678
2015	7.62488
2020	7.17891
2025	6.57829
2030	6.25309
2035	6.07604
2040	5.8963
2045	5.66166
2050	5.40554
2055	5.20206
2060	5.06163
2065	4.97619
2070	4.89645
2075	4.80084
2080	4.68594
2085	4.57498
2090	4.49317
2095	4.44078
2100	4.40791