Year	Percent
1950	13.21245
1955	12.86151
1960	12.57448
1965	12.72779
1970	13.21937
1975	13.35328
1980	13.09617
1985	12.53763
1990	12.07316
1995	12.31397
2000	12.69085
2005	13.21057
2010	14.06121
2015	15.03226
2020	16.52709
2025	18.33774
2030	20.03209
2035	21.81622
2040	23.30698
2045	24.44903
2050	24.96328
2055	24.99497
2060	24.88121
2065	24.67579
2070	24.72788
2075	24.69464
2080	24.49222
2085	24.19421
2090	23.8764
2095	23.58427
2100	23.31777