Year	Percent
1950	19.05173
1955	16.76413
1960	17.32358
1965	18.03586
1970	18.59343
1975	18.90941
1980	19.16445
1985	19.14219
1990	18.28649
1995	18.26814
2000	17.96016
2005	17.69416
2010	17.60783
2015	16.0981
2020	15.54754
2025	14.88816
2030	14.12864
2035	13.30327
2040	12.52147
2045	11.79657
2050	11.1119
2055	10.48738
2060	9.89604
2065	9.34369
2070	8.8252
2075	8.34082
2080	7.89823
2085	7.49337
2090	7.11453
2095	6.78553
2100	6.49015