Year	Percent
1950	14.29358
1955	15.10754
1960	15.91159
1965	16.31202
1970	16.5187
1975	16.76885
1980	16.91835
1985	17.07306
1990	17.07073
1995	16.39846
2000	16.3007
2005	16.27884
2010	16.03149
2015	16.02057
2020	15.06457
2025	14.75058
2030	14.35043
2035	13.56467
2040	12.53811
2045	11.59008
2050	10.83602
2055	10.22248
2060	9.66907
2065	9.10984
2070	8.56659
2075	8.05633
2080	7.61738
2085	7.26103
2090	6.95122
2095	6.67505
2100	6.40314