Year	Percent
1950	13.49864
1955	13.56159
1960	13.70198
1965	13.81368
1970	13.8108
1975	13.84267
1980	13.93033
1985	14.01589
1990	13.82365
1995	12.94808
2000	12.46391
2005	12.29644
2010	12.40298
2015	12.88513
2020	13.30639
2025	13.73284
2030	14.49014
2035	15.51498
2040	16.70157
2045	17.83718
2050	18.84102
2055	19.73396
2060	20.58022
2065	21.45354
2070	22.24078
2075	22.92449
2080	23.49565
2085	24.00489
2090	24.49078
2095	24.96165
2100	25.3786