Year	Percent
1950	15.71742
1955	15.86514
1960	15.91166
1965	16.4551
1970	16.88059
1975	17.6418
1980	17.89068
1985	18.09509
1990	17.87862
1995	17.60541
2000	17.66378
2005	17.32059
2010	16.6979
2015	15.49187
2020	14.53567
2025	13.64601
2030	12.83069
2035	12.01855
2040	11.24121
2045	10.5057
2050	9.84208
2055	9.2558
2060	8.70626
2065	8.2242
2070	7.78665
2075	7.40447
2080	7.07151
2085	6.79046
2090	6.5524
2095	6.34161
2100	6.16411