Year	Percent
1950	29.09273
1955	27.71208
1960	26.17142
1965	25.73572
1970	26.10191
1975	28.53568
1980	29.97925
1985	32.17891
1990	31.62866
1995	31.24375
2000	28.84852
2005	27.48693
2010	26.89477
2015	26.61729
2020	27.24656
2025	27.0253
2030	26.53493
2035	25.38414
2040	24.83614
2045	24.81223
2050	24.37803
2055	23.99365
2060	23.55687
2065	23.11875
2070	22.7345
2075	22.45045
2080	22.2196
2085	21.99789
2090	21.77467
2095	21.54581
2100	21.33045