Year	Percent
1950	27.55271
1955	27.87837
1960	30.71316
1965	28.95225
1970	27.57746
1975	27.16458
1980	26.85263
1985	27.57518
1990	27.18224
1995	26.11199
2000	25.97716
2005	25.89187
2010	26.22744
2015	24.86513
2020	22.74499
2025	20.80989
2030	19.5426
2035	19.56928
2040	20.88152
2045	21.42897
2050	20.47998
2055	19.76143
2060	19.33551
2065	19.45681
2070	20.05552
2075	20.61366
2080	20.67471
2085	20.29494
2090	19.86236
2095	19.66928
2100	19.76829