Year	Percent
1950	12.78958
1955	13.05698
1960	13.14008
1965	13.0942
1970	12.94246
1975	12.80746
1980	12.74566
1985	12.78972
1990	13.05662
1995	12.93311
2000	13.14491
2005	13.47325
2010	13.98275
2015	14.88347
2020	15.82689
2025	16.86767
2030	17.74435
2035	18.55032
2040	19.24983
2045	19.76661
2050	20.53171
2055	21.52477
2060	22.32239
2065	22.97126
2070	23.33072
2075	23.48676
2080	23.76432
2085	24.17309
2090	24.5952
2095	24.89934
2100	25.07021