Year	Percent
1950	28.68344
1955	27.94546
1960	27.69662
1965	27.35017
1970	26.60832
1975	26.93183
1980	26.97015
1985	26.83787
1990	27.2086
1995	26.8223
2000	27.38175
2005	29.36102
2010	31.20006
2015	32.88025
2020	33.58661
2025	32.9487
2030	32.31627
2035	31.67474
2040	31.02892
2045	30.41198
2050	29.66758
2055	28.99217
2060	28.33425
2065	27.77837
2070	27.29475
2075	26.86125
2080	26.43154
2085	26.00802
2090	25.63803
2095	25.31859
2100	25.04842