Year	Percent
1950	29.54812
1955	27.01453
1960	25.44058
1965	25.34926
1970	25.26816
1975	27.87195
1980	30.96808
1985	32.83003
1990	32.20198
1995	31.90818
2000	31.73171
2005	32.77815
2010	33.57473
2015	32.56875
2020	30.25776
2025	27.10229
2030	25.52315
2035	25.6708
2040	26.12223
2045	25.68675
2050	24.48441
2055	23.3023
2060	22.88741
2065	23.08332
2070	23.40367
2075	23.42602
2080	23.08194
2085	22.6382
2090	22.40674
2095	22.4524
2100	22.59577