Year	Percent
1950	16.14268
1955	16.24011
1960	16.68378
1965	17.01749
1970	17.54759
1975	17.87136
1980	18.7348
1985	19.09965
1990	18.87272
1995	18.73918
2000	18.71352
2005	18.52399
2010	18.21791
2015	17.45515
2020	16.61224
2025	15.83779
2030	15.14435
2035	14.44222
2040	13.71896
2045	12.96997
2050	12.24204
2055	11.59345
2060	10.98426
2065	10.44174
2070	9.92573
2075	9.42601
2080	8.95693
2085	8.52415
2090	8.10902
2095	7.74102
2100	7.40578