Under the 2004 constitution, both presidential and parliamentary elections were to be held every five years. However, due to the disputed 2014 presidential election, the scheduled 2015 parliamentary elections were delayed until 2018. Presidential elections used the two-round system; if no candidate received a majority of the vote in the first round, a second round would be held featuring the top two candidates. Parliamentary elections had only one round and were based on the single non-transferable vote system, which allows some candidates to be elected with as little as one percent of the vote.