Year	Percent
1950	15.79183
1955	16.10434
1960	16.54627
1965	17.07816
1970	17.44897
1975	17.70004
1980	17.70415
1985	16.98283
1990	16.30997
1995	15.95636
2000	16.19865
2005	16.42186
2010	16.50155
2015	16.14992
2020	14.96467
2025	14.32056
2030	13.99498
2035	13.66976
2040	13.13344
2045	12.45102
2050	11.81934
2055	11.307
2060	10.8588
2065	10.42966
2070	9.95966
2075	9.48548
2080	9.04844
2085	8.64847
2090	8.29781
2095	7.94481
2100	7.61474