Year	Percent
1950	15.52263
1955	15.48683
1960	15.41065
1965	15.17561
1970	14.81342
1975	14.35034
1980	13.77962
1985	13.04222
1990	12.35374
1995	11.86626
2000	11.49777
2005	11.35438
2010	11.49161
2015	11.85313
2020	12.61427
2025	13.74055
2030	14.92203
2035	15.88975
2040	16.62989
2045	17.40138
2050	18.32796
2055	19.34893
2060	20.31014
2065	21.03072
2070	21.52777
2075	21.95568
2080	22.39154
2085	22.83986
2090	23.25881
2095	23.60125
2100	23.87607