Year	Percent
1950	11.101
1955	10.06526
1960	10.90441
1965	12.51541
1970	13.60488
1975	13.86398
1980	13.98227
1985	13.25326
1990	12.53576
1995	13.36728
2000	11.92892
2005	11.97296
2010	11.71036
2015	10.83078
2020	9.30596
2025	8.88187
2030	8.68363
2035	8.33294
2040	7.8116
2045	7.2698
2050	6.83106
2055	6.52433
2060	6.30308
2065	6.09362
2070	5.88429
2075	5.68094
2080	5.52272
2085	5.41422
2090	5.33651
2095	5.27589
2100	5.20935