Year	Percent
1950	22.87467
1955	22.82376
1960	22.78262
1965	22.52488
1970	22.24862
1975	21.33761
1980	19.92715
1985	19.7201
1990	21.18284
1995	23.48501
2000	26.07754
2005	27.95676
2010	27.84628
2015	26.65862
2020	25.05826
2025	23.98821
2030	23.99493
2035	24.71515
2040	25.16876
2045	25.25489
2050	24.987
2055	24.1857
2060	23.83204
2065	23.6929
2070	23.56184
2075	23.66439
2080	23.57134
2085	23.32992
2090	23.09174
2095	22.9522
2100	22.90276