Year	Percent
1950	27.92828
1955	28.02174
1960	27.95127
1965	27.79705
1970	28.00372
1975	27.39055
1980	27.14934
1985	27.12002
1990	26.10215
1995	25.82536
2000	25.36797
2005	26.28425
2010	26.28479
2015	27.67341
2020	29.57147
2025	31.63925
2030	33.67763
2035	34.41478
2040	34.3254
2045	33.56212
2050	32.45053
2055	31.65371
2060	30.70668
2065	29.69763
2070	28.58515
2075	27.44409
2080	26.37187
2085	25.42574
2090	24.63933
2095	23.97178
2100	23.38255