Presidential candidates can be nominated by registered parties which have received at least one seat in the previous parliamentary elections. A candidate may also be nominated by 20,000 enfranchised citizens. Between 1919 and 1988, the president was elected indirectly by an electoral college made up of electors chosen by voters in the presidential election. In the 1988 presidential election, a direct and an indirect election were conducted in parallel: if no candidate could gain a majority, the president was elected by an electoral college formed in the same elections. Since 1994, the president has been elected by a direct popular vote.