Year	Percent
1950	29.69121
1955	29.92112
1960	29.77378
1965	28.53643
1970	26.67265
1975	26.24965
1980	27.23521
1985	29.13472
1990	31.72441
1995	33.5972
2000	34.70023
2005	34.04634
2010	33.46416
2015	32.4319
2020	31.61804
2025	31.09546
2030	30.63629
2035	30.52869
2040	30.18023
2045	29.46751
2050	28.86401
2055	28.05555
2060	27.49366
2065	27.06493
2070	26.65561
2075	26.19261
2080	25.70051
2085	25.24981
2090	24.88358
2095	24.58711
2100	24.32272