Year	Percent
1950	20.40765
1955	19.68582
1960	19.11133
1965	18.89492
1970	19.13599
1975	19.01456
1980	18.55158
1985	18.56248
1990	19.87396
1995	21.80113
2000	24.60186
2005	26.5378
2010	26.18074
2015	25.46278
2020	24.63558
2025	24.54263
2030	24.70181
2035	25.51772
2040	25.42965
2045	24.7542
2050	24.84601
2055	24.08643
2060	24.14927
2065	24.3145
2070	23.80278
2075	23.43657
2080	23.11399
2085	22.88151
2090	22.75211
2095	22.64485
2100	22.48104