Additional information about gender quotas

https://www.mp.se/sites/default/files/den_grona_vagen_till_jamstalldhet.pdf 

In 1972 the Liberal Party introduced a policy of a minimum of 40 percent of either sex in internal boards and Committees. This recommendation was in 1984 extended to include alternated lists at general election (where one sex alternates the other on party ballots).

In 1987 the Christian Democratic Party introduced a 40 percent gender neutral recommendation regarding electoral ballots.

The Conservative Party and the Centre Party both decided on equal representation targets, in 1993 and 1996 respectively, but gave nomination committees the final word concerning the lists of candidates.

The Green Party have a quota principal or "equality system", of having two party leaders (språkrör) to "ensure equality" (Miljöpartiet).