Year	Percent
1950	14.47607
1955	14.16074
1960	13.86149
1965	13.50275
1970	13.20718
1975	13.13387
1980	13.37563
1985	13.91329
1990	14.69793
1995	15.78554
2000	17.16462
2005	18.78966
2010	20.42083
2015	21.84753
2020	22.79788
2025	23.2767
2030	23.47016
2035	23.42635
2040	23.54323
2045	23.69277
2050	23.95087
2055	24.37351
2060	24.58367
2065	24.74094
2070	24.76529
2075	24.60581
2080	24.44393
2085	24.25906
2090	24.02746
2095	23.76153
2100	23.49365