Year	Percent
1950	40.9153
1955	40.91489
1960	41.04244
1965	31.61769
1970	21.23685
1975	21.36865
1980	21.04288
1985	22.51771
1990	24.27366
1995	25.43296
2000	28.5132
2005	28.45724
2010	29.45599
2015	29.40226
2020	28.46966
2025	29.65594
2030	30.19283
2035	31.10889
2040	31.43718
2045	31.11463
2050	30.74768
2055	30.49552
2060	30.39284
2065	30.25236
2070	29.96751
2075	29.58405
2080	29.16983
2085	28.77146
2090	28.421
2095	28.09912
2100	27.77259