Year	Percent
1950	12.52077
1955	12.78247
1960	12.88154
1965	12.85727
1970	12.73386
1975	12.64393
1980	12.62066
1985	12.7005
1990	13.01591
1995	12.82054
2000	12.96993
2005	13.24598
2010	13.60458
2015	14.34152
2020	15.10781
2025	15.98056
2030	16.9224
2035	17.95078
2040	18.90323
2045	19.63536
2050	20.48351
2055	21.46015
2060	22.23259
2065	22.86332
2070	23.21453
2075	23.39378
2080	23.71212
2085	24.17329
2090	24.65311
2095	25.01362
2100	25.23606