Year	Percent
1950	13.26357
1955	13.96847
1960	15.37691
1965	15.6051
1970	15.61012
1975	15.9254
1980	15.73065
1985	15.88336
1990	15.65215
1995	15.04257
2000	14.60795
2005	13.72861
2010	12.69389
2015	11.28073
2020	9.94111
2025	9.38066
2030	8.82808
2035	8.23242
2040	7.61367
2045	7.05938
2050	6.60795
2055	6.24321
2060	5.96091
2065	5.71927
2070	5.5198
2075	5.3254
2080	5.17582
2085	5.06153
2090	4.98411
2095	4.92485
2100	4.87551