Year	Percent
1950	15.20749
1955	15.47404
1960	15.41609
1965	15.00847
1970	14.33641
1975	13.64054
1980	13.00254
1985	12.25552
1990	11.56522
1995	11.65615
2000	12.13694
2005	12.77515
2010	13.44372
2015	13.9147
2020	14.54863
2025	15.61335
2030	16.84838
2035	17.91887
2040	18.76792
2045	19.41623
2050	20.14679
2055	21.1173
2060	22.03661
2065	22.7931
2070	23.32053
2075	23.68453
2080	24.09581
2085	24.56896
2090	25.05094
2095	25.45691
2100	25.77229