Year	Percent
1950	15.83511
1955	19.66974
1960	19.08691
1965	18.96779
1970	18.84316
1975	19.38777
1980	19.94156
1985	19.7286
1990	19.7672
1995	19.37701
2000	18.93293
2005	19.02292
2010	18.96119
2015	18.10203
2020	17.26987
2025	16.60809
2030	16.01364
2035	15.38135
2040	14.70652
2045	13.99957
2050	13.29834
2055	12.63875
2060	12.02697
2065	11.46118
2070	10.92434
2075	10.40157
2080	9.9098
2085	9.45797
2090	9.03162
2095	8.6349
2100	8.25731