Year	Percent
1950	26.21675
1955	25.21319
1960	24.93351
1965	25.1997
1970	25.81525
1975	27.49492
1980	29.01535
1985	30.34557
1990	31.10381
1995	30.85823
2000	30.66903
2005	30.52893
2010	30.96119
2015	31.51232
2020	31.95077
2025	32.21801
2030	32.11734
2035	31.68531
2040	31.28165
2045	31.02127
2050	30.79154
2055	30.4002
2060	29.9129
2065	29.39681
2070	28.88157
2075	28.3511
2080	27.79597
2085	27.22156
2090	26.62819
2095	26.04908
2100	25.51323