Year	Percent
1950	30.60473
1955	30.34099
1960	32.62884
1965	30.85784
1970	29.21277
1975	29.10734
1980	28.55307
1985	28.10836
1990	28.93432
1995	28.87467
2000	29.29255
2005	30.77704
2010	29.26902
2015	27.16896
2020	24.87062
2025	24.01929
2030	22.55014
2035	22.21897
2040	22.03369
2045	21.8289
2050	21.32053
2055	21.12872
2060	21.11421
2065	21.228
2070	21.38162
2075	21.45861
2080	21.38709
2085	21.25415
2090	21.16317
2095	21.12544
2100	21.11598