Year	Percent
1950	11.24704
1955	10.54649
1960	10.50781
1965	12.14857
1970	12.3437
1975	12.37125
1980	12.45173
1985	12.61821
1990	12.67316
1995	12.3433
2000	12.2311
2005	12.54412
2010	12.86766
2015	12.45489
2020	11.92729
2025	11.40272
2030	11.24575
2035	11.03259
2040	10.70246
2045	10.27926
2050	9.87627
2055	9.53586
2060	9.22915
2065	8.92739
2070	8.6037
2075	8.28846
2080	7.99417
2085	7.70616
2090	7.44484
2095	7.18605
2100	6.93102