Year	Percent
1950	27.79004
1955	27.54788
1960	27.06981
1965	26.59938
1970	27.32674
1975	28.45987
1980	30.47199
1985	32.32698
1990	32.54162
1995	32.21619
2000	31.92183
2005	31.68236
2010	31.7793
2015	32.14161
2020	31.57074
2025	29.78487
2030	27.86265
2035	26.05394
2040	24.58716
2045	23.66084
2050	22.69208
2055	21.84186
2060	21.09697
2065	20.5522
2070	20.17099
2075	19.91918
2080	19.75631
2085	19.63704
2090	19.54378
2095	19.47486
2100	19.4409