In the wake of the amendments, the 2012 elections saw women win more than one-third of seats in both houses for the first time in Mexico’s history. In 2014, wider-ranging debate on electoral reform led to the revision of Article 41 of the Constitution, which now requires parties to enforce gender parity among their election nominees. The remaining 200 representatives are elected using the proportional representation system through closed party lists in five districts of 40 seats each.