Year	Percent
1950	29.0827
1955	27.13137
1960	26.26115
1965	25.12279
1970	25.74437
1975	26.324
1980	27.58771
1985	29.46503
1990	29.73253
1995	29.58395
2000	28.59984
2005	27.41282
2010	26.68875
2015	26.34208
2020	25.71739
2025	24.51636
2030	23.82085
2035	23.58682
2040	23.74718
2045	24.07974
2050	23.7393
2055	23.2089
2060	22.7979
2065	22.60305
2070	22.60634
2075	22.62713
2080	22.48639
2085	22.17789
2090	21.83726
2095	21.57662
2100	21.42046