1999 Riojan regional election  The 1999 Riojan regional election was held on Sunday, 13 June 1999, to elect the 5th Parliament of the autonomous community of La Rioja. All 33 seats in the Parliament were up for election. The election was held simultaneously with regional elections in twelve other autonomous communities and local elections all throughout Spain, as well as the 1999 European Parliament election. In a turnout below 69%, the People's Party (PP) under incumbent President Pedro Sanz was re-elected for a second term in office with an increased absolute majority. The Spanish Socialist Workers' Party (PSOE) under former president José Ignacio Pérez Sáenz saw a slight increase in support, but the new PP majority meant that the party would remain in opposition. United Left (IU) failed to reach the 5% electoral threshold, resulting in the loss of all its 2 seats, while the Riojan Party (PR) maintained its 2 seats. The Parliament of La Rioja was the devolved, unicameral legislature of the autonomous community of La Rioja, having legislative power in regional matters as defined by the Spanish Constitution and the Riojan Statute of Autonomy, as well as the ability to vote confidence in or withdraw it from a President of the Autonomous Community. Voting for the Parliament was on the basis of universal suffrage, which comprised all nationals over eighteen, registered in La Rioja and in full enjoyment of their political rights. The 33 members of the Parliament of La Rioja were elected using the D'Hondt method and a closed list proportional representation, with a threshold of 5 percent of valid votes—which included blank ballots—being applied regionally. Parties not reaching the threshold were not taken into consideration for seat distribution. The electoral law provided that parties, federations, coalitions and groupings of electors were allowed to present lists of candidates. However, groupings of electors were required to secure the signature of at least 1 percent of the electors registered in La Rioja. Electors were barred from signing for more than one list of candidates. Concurrently, parties and federations intending to enter in coalition to take part jointly at an election were required to inform the relevant Electoral Commission within ten days of the election being called. The term of the Parliament of La Rioja expired four years after the date of its previous election. Elections to the Parliament were fixed for the fourth Sunday of May every four years. Legal amendments introduced in 1998 allowed for these to be held together with European Parliament elections, provided that they were scheduled for within a four month-timespan.