Year	% female
1970	45.41407
1972	47.74966
1973	47.99651
1974	48.74874
1975	49.2504
1976	50.03713
1977	49.91498
1978	50.40696
1980	50.67702
1981	50.76468
1983	50.74363
1984	49.85648
1985	49.80188
1986	49.70875
1987	49.74489
1991	47.94636
1992	49.05018
1998	50.32717
1999	51.16492
2000	50.72874
2001	50.27014
2002	50.44219
2003	50.26308
2004	50.13085
2006	50.72973
2007	51.13423
2008	50.16081
2009	50.75406
2011	50.45534
2012	50.99636