Year	Percent
1950	13.89189
1955	14.325
1960	14.0956
1965	14.85456
1970	15.34416
1975	15.69866
1980	14.74564
1985	13.76993
1990	12.79048
1995	11.81099
2000	10.68063
2005	10.00801
2010	9.46592
2015	8.46522
2020	8.15591
2025	7.50722
2030	7.07126
2035	6.61263
2040	6.24136
2045	5.9791
2050	5.81714
2055	5.67653
2060	5.52833
2065	5.37731
2070	5.22864
2075	5.13068
2080	5.05619
2085	5.00764
2090	4.94756
2095	4.87645
2100	4.81021