Year	Percent
1950	26.97603
1955	26.39671
1960	24.83222
1965	24.17049
1970	22.62271
1975	22.87084
1980	26.44848
1985	30.81676
1990	32.99319
1995	33.65425
2000	33.12835
2005	31.44088
2010	30.88065
2015	30.39345
2020	30.64394
2025	30.3411
2030	29.89049
2035	29.25482
2040	28.63029
2045	28.12537
2050	27.58132
2055	26.85173
2060	26.10846
2065	25.41204
2070	24.79875
2075	24.29419
2080	23.86789
2085	23.48422
2090	23.12545
2095	22.78206
2100	22.48834