Year	Percent
1950	12.35998
1955	12.39881
1960	12.55304
1965	12.26855
1970	12.49509
1975	12.5838
1980	12.66293
1985	12.81166
1990	12.91599
1995	12.93046
2000	12.94022
2005	12.61684
2010	12.65777
2015	12.78231
2020	13.00364
2025	12.92691
2030	12.44177
2035	12.07138
2040	11.79313
2045	11.52113
2050	11.20315
2055	10.83885
2060	10.44649
2065	10.08654
2070	9.75981
2075	9.42811
2080	9.11508
2085	8.79667
2090	8.4906
2095	8.20515
2100	7.94545