Year	Percent
1950	17.29809
1955	19.36388
1960	19.83454
1965	20.13989
1970	20.37654
1975	20.81037
1980	20.77873
1985	20.42799
1990	19.23669
1995	17.29093
2000	17.50193
2005	17.11972
2010	16.53638
2015	15.05621
2020	14.11302
2025	13.32083
2030	12.6317
2035	11.93419
2040	11.20805
2045	10.51256
2050	9.90528
2055	9.34934
2060	8.84069
2065	8.36886
2070	7.92385
2075	7.49524
2080	7.11795
2085	6.80001
2090	6.51662
2095	6.26991
2100	6.04865