Year	Percent
1950	15.97963
1955	16.35107
1960	16.62062
1965	16.76173
1970	16.63172
1975	16.18692
1980	15.70174
1985	15.06686
1990	14.30533
1995	14.52848
2000	14.26509
2005	14.71661
2010	15.72251
2015	17.04229
2020	19.05312
2025	21.20729
2030	23.55949
2035	25.96998
2040	28.26685
2045	29.88011
2050	30.32538
2055	29.32852
2060	27.94052
2065	26.663
2070	25.72623
2075	25.36562
2080	24.67524
2085	23.8764
2090	23.23503
2095	22.90676
2100	22.77153