Year	Percent
1950	16.3256
1955	16.94474
1960	16.6109
1965	16.50667
1970	16.66554
1975	16.94088
1980	17.33683
1985	17.26989
1990	17.60303
1995	17.28416
2000	14.94884
2005	13.07938
2010	12.46345
2015	11.57917
2020	10.65238
2025	9.68438
2030	8.8156
2035	8.07992
2040	7.45568
2045	6.91646
2050	6.44801
2055	6.04963
2060	5.72068
2065	5.46946
2070	5.27503
2075	5.11547
2080	4.9858
2085	4.88231
2090	4.79986
2095	4.73731
2100	4.69591