Year	Percent
1950	9.89994
1955	8.98279
1960	7.99003
1965	8.43874
1970	10.89336
1975	11.18336
1980	10.93955
1985	10.34926
1990	9.87407
1995	9.69708
2000	9.31983
2005	10.71216
2010	10.8726
2015	9.828
2020	8.24204
2025	6.08311
2030	5.5954
2035	5.42799
2040	6.06216
2045	5.97645
2050	5.33013
2055	4.65078
2060	4.33266
2065	4.41428
2070	4.66474
2075	4.81282
2080	4.71196
2085	4.50184
2090	4.38332
2095	4.45151
2100	4.61198