Year	Percent
1950	30.06713
1955	29.48297
1960	29.06246
1965	28.34829
1970	27.23306
1975	28.62652
1980	30.37787
1985	31.97986
1990	32.52722
1995	31.58307
2000	30.22359
2005	28.06514
2010	28.10516
2015	28.71417
2020	28.31157
2025	27.26702
2030	26.24707
2035	25.49334
2040	25.02803
2045	24.90222
2050	25.00276
2055	24.96393
2060	24.63737
2065	24.26151
2070	23.95432
2075	23.74175
2080	23.5941
2085	23.42814
2090	23.16818
2095	22.81618
2100	22.44358