Dikla is the only woman on the list of most played singers. Naomi Shemer is the only woman on the list of most played songwriters and composers.
Some two months ago the Van Leer Institute published the "Gender Index" – a study which examined the unequal representation of women in four areas of Israel's cultural life.
For the article (in Hebrew): http://www.haaretz.co.il/gallery/music/.premium-1.3163040
See also in the attached file.