Year	Percent
1950	19.78411
1955	20.60544
1960	19.34457
1965	18.71486
1970	20.74844
1975	22.19164
1980	25.26923
1985	24.26183
1990	21.92346
1995	21.98929
2000	22.37005
2005	25.14731
2010	26.71804
2015	27.01001
2020	26.48848
2025	25.87364
2030	26.54048
2035	26.73635
2040	25.57422
2045	23.85276
2050	22.94826
2055	23.29572
2060	24.39792
2065	25.47665
2070	24.96479
2075	23.51059
2080	22.87546
2085	23.08158
2090	23.57464
2095	23.73626
2100	23.3767