Year	Percent
1950	27.64437
1955	27.94155
1960	27.91062
1965	27.71476
1970	27.73012
1975	26.98615
1980	26.87413
1985	27.29901
1990	27.89614
1995	28.70669
2000	29.28899
2005	29.53692
2010	29.71335
2015	30.28664
2020	30.7493
2025	30.96496
2030	31.36068
2035	31.86008
2040	32.00626
2045	31.94658
2050	31.52631
2055	30.92567
2060	30.56442
2065	30.4173
2070	30.29862
2075	30.05776
2080	29.69904
2085	29.27817
2090	28.8761
2095	28.52271
2100	28.16904