Year	% female
1971	37.00335
1972	39.40952
1973	42.11207
1974	44.37226
1975	45.37804
1976	46.04086
1977	46.82023
1978	47.11798
1979	47.12709
1980	47.17539
1981	47.45769
1983	47.38455
1986	47.62045
1999	48.49551
2001	49.2337
2002	48.80592
2003	47.97788
2004	48.00249
2005	48.41897
2006	47.65522