Year	Percent
1950	16.32181
1955	15.1972
1960	15.38361
1965	16.0796
1970	16.6613
1975	17.56493
1980	17.94783
1985	18.19777
1990	17.93841
1995	17.65245
2000	17.83547
2005	17.72822
2010	17.09864
2015	15.88474
2020	14.89322
2025	13.98975
2030	13.11013
2035	12.25535
2040	11.45951
2045	10.71404
2050	10.05075
2055	9.46814
2060	8.92346
2065	8.44781
2070	8.01745
2075	7.64407
2080	7.32557
2085	7.0633
2090	6.84627
2095	6.6557
2100	6.49918