Year	Percent
1950	29.47541
1955	29.50245
1960	29.41509
1965	29.21707
1970	28.81146
1975	27.77583
1980	26.67968
1985	25.87122
1990	25.72836
1995	26.51761
2000	27.48469
2005	28.4031
2010	28.95128
2015	29.3759
2020	30.04258
2025	30.92266
2030	32.06322
2035	32.85321
2040	33.22563
2045	33.20303
2050	32.85772
2055	32.49681
2060	32.06323
2065	31.54292
2070	30.96267
2075	30.37847
2080	29.79361
2085	29.23494
2090	28.69083
2095	28.15748
2100	27.65757