Year	Percent
1950	15.3792
1955	15.64815
1960	14.97265
1965	14.5406
1970	14.62551
1975	14.90991
1980	15.77189
1985	16.50402
1990	16.79691
1995	18.23724
2000	21.01503
2005	24.00322
2010	25.86661
2015	27.23278
2020	26.16982
2025	25.43482
2030	25.30944
2035	26.11355
2040	27.87585
2045	27.40021
2050	25.96938
2055	24.46655
2060	22.03306
2065	21.68016
2070	22.62883
2075	22.61399
2080	22.14841
2085	21.38879
2090	20.81866
2095	20.75376
2100	21.07733