Year	Percent
1950	25.50569
1955	25.79989
1960	24.55031
1965	23.05913
1970	22.40969
1975	22.74549
1980	24.02212
1985	25.06841
1990	26.5163
1995	26.83696
2000	28.17707
2005	29.56821
2010	30.45801
2015	30.27336
2020	29.18221
2025	27.9971
2030	26.71796
2035	26.38802
2040	25.99582
2045	24.8541
2050	23.90717
2055	23.47796
2060	23.69606
2065	24.11062
2070	24.31729
2075	24.119
2080	23.64659
2085	23.24393
2090	23.04979
2095	23.03479
2100	23.049