Year	Percent
1950	20.78892
1955	22.1192
1960	21.01314
1965	20.80739
1970	18.98901
1975	17.31167
1980	16.65908
1985	15.89088
1990	17.25972
1995	19.43289
2000	20.52188
2005	21.03331
2010	20.85822
2015	20.51142
2020	21.10494
2025	21.56963
2030	21.77172
2035	21.42139
2040	21.22809
2045	21.32161
2050	21.87873
2055	22.92669
2060	23.43451
2065	23.62226
2070	23.46603
2075	23.02949
2080	22.97457
2085	23.158
2090	23.34749
2095	23.35276
2100	23.13531