Year	Percent
1950	9.78648
1955	10.35615
1960	11.38482
1965	12.51363
1970	13.9013
1975	13.00496
1980	11.14152
1985	9.71026
1990	8.65952
1995	8.62917
2000	9.01672
2005	8.29559
2010	7.16154
2015	6.52111
2020	5.89987
2025	6.04924
2030	6.07481
2035	5.93679
2040	5.80561
2045	5.65667
2050	5.54584
2055	5.50421
2060	5.49033
2065	5.43756
2070	5.33696
2075	5.22809
2080	5.14521
2085	5.09453
2090	5.06473
2095	5.03297
2100	4.99098