Year	Percent
1950	9.40181
1955	9.58713
1960	10.36497
1965	11.45356
1970	13.05883
1975	14.22964
1980	14.62012
1985	15.19022
1990	18.53034
1995	19.02747
2000	19.97685
2005	21.46035
2010	24.7645
2015	27.06761
2020	28.74177
2025	30.21914
2030	31.04871
2035	30.97289
2040	31.17819
2045	31.51364
2050	31.74572
2055	32.39596
2060	32.60852
2065	32.82217
2070	33.37101
2075	33.84518
2080	34.36814
2085	34.88949
2090	35.35914
2095	35.80676
2100	36.30373