Year	Percent
1950	21.74395
1955	22.43359
1960	21.88334
1965	21.81714
1970	22.10556
1975	22.00671
1980	22.95211
1985	23.62003
1990	26.56361
1995	28.65083
2000	30.07978
2005	30.72052
2010	28.48446
2015	26.33929
2020	25.27087
2025	24.6301
2030	24.45052
2035	25.30464
2040	25.12983
2045	24.57488
2050	24.43522
2055	23.96102
2060	24.09663
2065	24.31825
2070	24.14475
2075	23.93588
2080	23.64575
2085	23.41058
2090	23.2893
2095	23.22669
2100	23.12416