Year	Percent
1950	23.14722
1955	24.54524
1960	23.53742
1965	24.25579
1970	24.10838
1975	23.72312
1980	25.3537
1985	24.68648
1990	25.10291
1995	25.44188
2000	25.93375
2005	27.68389
2010	28.92679
2015	30.18306
2020	29.96681
2025	27.96679
2030	25.37898
2035	23.01685
2040	21.77006
2045	21.63819
2050	22.03365
2055	22.22564
2060	22.31242
2065	22.12419
2070	21.76458
2075	21.75302
2080	21.87595
2085	21.99451
2090	21.96227
2095	21.75842
2100	21.47502