Year	Percent
1950	11.88739
1955	12.02883
1960	14.17015
1965	14.49397
1970	14.62575
1975	14.79268
1980	15.00046
1985	15.12802
1990	14.78993
1995	14.6463
2000	14.83812
2005	15.05971
2010	14.4909
2015	13.84909
2020	13.19208
2025	12.91078
2030	12.57189
2035	12.10569
2040	11.55494
2045	11.0373
2050	10.59473
2055	10.19233
2060	9.8006
2065	9.39129
2070	8.99688
2075	8.6306
2080	8.2737
2085	7.94937
2090	7.63245
2095	7.32281
2100	7.03957