Year	Percent
1950	28.52155
1955	27.1818
1960	26.35396
1965	24.59598
1970	23.84742
1975	25.65797
1980	27.62426
1985	31.37385
1990	34.39978
1995	34.81465
2000	33.4506
2005	30.1367
2010	27.56347
2015	25.56427
2020	24.3914
2025	24.66774
2030	24.87188
2035	24.91097
2040	24.27399
2045	23.17984
2050	22.5365
2055	22.05625
2060	21.82784
2065	21.55265
2070	21.11018
2075	20.56702
2080	20.0761
2085	19.70934
2090	19.4447
2095	19.2318
2100	19.02411