Year	Percent
1950	20.85564
1955	21.68288
1960	21.67423
1965	22.02345
1970	22.78245
1975	23.17527
1980	23.06033
1985	22.31512
1990	21.46966
1995	20.97914
2000	21.53834
2005	22.55801
2010	23.0076
2015	23.73914
2020	24.26111
2025	24.20118
2030	24.75626
2035	25.25539
2040	25.38298
2045	25.73088
2050	25.59733
2055	25.01745
2060	24.56416
2065	24.31134
2070	24.11504
2075	23.89882
2080	23.61989
2085	23.31382
2090	23.04612
2095	22.84512
2100	22.69378