Year	Percent
1950	9.21324
1955	8.74079
1960	9.0579
1965	9.80196
1970	11.13625
1975	12.8485
1980	12.77568
1985	11.13564
1990	9.02917
1995	8.38873
2000	8.64651
2005	8.47628
2010	8.35092
2015	7.4464
2020	7.06702
2025	6.36967
2030	6.5641
2035	6.57245
2040	6.40954
2045	6.23943
2050	6.0373
2055	5.87442
2060	5.78314
2065	5.72346
2070	5.6303
2075	5.50186
2080	5.37682
2085	5.29231
2090	5.2434
2095	5.22052
2100	5.19217