Year	Percent
1950	28.59852
1955	28.97761
1960	30.2435
1965	29.84197
1970	30.36425
1975	31.67491
1980	32.4553
1985	33.13464
1990	33.11021
1995	31.05337
2000	30.83901
2005	31.19929
2010	31.46739
2015	31.462
2020	29.93988
2025	27.6422
2030	25.19766
2035	23.55621
2040	23.13369
2045	23.05322
2050	23.12422
2055	22.65016
2060	21.97533
2065	21.46843
2070	21.36186
2075	21.58445
2080	21.82744
2085	21.83882
2090	21.58391
2095	21.25367
2100	21.06343