Year	Percent
1950	21.1928
1955	21.25224
1960	19.57535
1965	20.81853
1970	22.71413
1975	24.66671
1980	26.20488
1985	24.39538
1990	24.00718
1995	24.77017
2000	26.00893
2005	27.23265
2010	27.32176
2015	26.13368
2020	26.22122
2025	26.51376
2030	27.02169
2035	26.77441
2040	26.02608
2045	25.5749
2050	24.54975
2055	23.83783
2060	23.53864
2065	23.2561
2070	23.26921
2075	23.23093
2080	23.05179
2085	22.81264
2090	22.64117
2095	22.56164
2100	22.50617