Year	Percent
1950	18.66658
1955	17.0133
1960	17.80799
1965	18.12105
1970	18.04564
1975	17.79317
1980	17.77111
1985	17.99411
1990	17.69463
1995	16.72691
2000	15.26391
2005	15.66223
2010	16.29347
2015	15.35949
2020	14.17125
2025	13.1963
2030	12.5358
2035	12.05049
2040	11.48922
2045	10.79038
2050	10.05847
2055	9.42797
2060	8.92963
2065	8.5123
2070	8.10648
2075	7.66866
2080	7.25146
2085	6.88761
2090	6.57771
2095	6.32198
2100	6.09557