constituencies. Prior to the 2011 parliamentary elections, elections to the Senate were conducted through plurality bloc voting in 40 multi-seat constituencies. Since 1991, elections have been supervised by National Electoral Commission (Państwowa Komisja Wyborcza), whose administrative division is called the National Electoral Office (Krajowe Biuro Wyborcze End of Communist rule 1989 parliamentary elections 1989 Parliamentary Election: the Polish Round Table Agreement produced a partly open parliamentary election. The June election produced a Sejm (lower house), in which one-third of the seats went to communists and one-third went to the two parties which had hitherto been their coalition partners. The remaining one-third of the seats in the Sejm and all those in the Senate were freely contested; the majority of these were by candidates supported by Solidarity. Jaruzelski was elected by the Sejm as President of Poland. The May 1990 local elections were entirely free. Candidates supported by Solidarity's Citizens' Committees won most of the elections they contested, although voter turnout was only a little over 40%. The cabinet was reshuffled in July 1990; the national defence and interior affairs ministers (hold-overs from the previous communist government) were among those replaced. 1990 presidential election In October 1990, the constitution was amended to curtail the term of President Jaruzelski. In December, Lech Wałęsa became the first popularly elected President of Poland. 1991 parliamentary election Poland's first free parliamentary elections were held in 1991. More than 100 parties participated, representing the full spectrum of political views. No single party received more than 13% of the total vote. 1993 parliamentary election After a rough start, the second group of elections were held in 1993, and the first parliament to serve a full term. The Democratic Left Alliance (SLD) received the largest share of votes. After the election, the SLD and Polish People's Party (PSL) formed a governing coalition. Waldemar Pawlak, leader of the junior partner PSL, became Prime Minister, later replaced by SLD's leader Józef Oleksy. 1995 presidential election In November 1995, Poland held its second post-war free presidential election. SLD leader Aleksander Kwaśniewski defeated Wałęsa by a narrow margin—51.7% to 48.3%. 1997 parliamentary election In 1997 parliamentary elections two parties with roots in the Solidarity movement – Solidarity Electoral Action (AWS) and the Freedom Union (UW) – won 261 of the 460 seats in the Sejm and formed a coalition government. Jerzy Buzek of the AWS became Prime Minister. The AWS and the