Year	Percent
1950	23.01274
1955	23.05942
1960	23.18769
1965	22.8775
1970	22.28987
1975	21.19943
1980	20.3921
1985	20.13279
1990	21.3791
1995	23.55667
2000	26.10942
2005	27.71602
2010	27.41265
2015	26.24456
2020	24.68737
2025	23.67254
2030	23.62165
2035	24.14065
2040	24.50973
2045	24.61458
2050	24.47037
2055	23.80705
2060	23.51128
2065	23.39539
2070	23.27063
2075	23.36179
2080	23.25303
2085	22.99352
2090	22.73789
2095	22.58414
2100	22.51784