Year	Percent
1950	27.22373
1955	26.77886
1960	26.10847
1965	29.71706
1970	32.28539
1975	31.7922
1980	35.70586
1985	37.20796
1990	33.69621
1995	37.9208
2000	38.59983
2005	45.03327
2010	49.37438
2015	45.18014
2020	40.9113
2025	36.81945
2030	35.09766
2035	34.79973
2040	33.38502
2045	31.59211
2050	29.55446
2055	27.89476
2060	27.10836
2065	26.55842
2070	25.97029
2075	25.32564
2080	24.70751
2085	24.25054
2090	23.93766
2095	23.67279
2100	23.38106