Year	% female
1971	28.37805
1972	29.33788
1973	30.31403
1974	30.80797
1975	31.54582
1976	32.11975
1977	31.95059
1978	32.40811
1979	33.10342
1980	30.17456
1981	29.89446
1982	30.72119
1983	31.85949
1984	31.99951
1985	32.00016
1987	33.41627
1988	33.46793
1989	33.23471
1990	34.26465
1991	35.91897
2001	41.2063
2015	46.74976
2016	48.00626
2018	48.89337