Year	Percent
1950	29.57546
1955	26.54773
1960	24.84129
1965	24.90673
1970	24.74143
1975	27.68295
1980	31.03182
1985	32.95709
1990	32.35083
1995	32.04956
2000	31.91413
2005	33.10018
2010	34.02411
2015	33.10356
2020	30.87139
2025	27.85394
2030	26.39051
2035	26.71584
2040	27.3271
2045	26.97984
2050	25.80385
2055	24.62676
2060	24.24401
2065	24.48207
2070	24.81214
2075	24.79134
2080	24.368
2085	23.84668
2090	23.56229
2095	23.56839
2100	23.65924