text: Independent Ukraine In a national referendum on 1 December 1991, 90.36% of Dnipropetrovsk's voters approved the declaration of independence that had been made by the Ukrainian parliament on 24 August. Amidst the economic dislocation and soaring inflation that accompanied the collapse of the Soviet Union, output declined. Although its economic contraction was at a rate below the national average, the Dnipropetrovsk city and oblast witnessed one of the largest population declines of all the regions of Ukraine. By 2021, the city's population, which had stood at over 1.2 million in 1991, had been reduced to 981,000. Young people from Dnipropetrovsk were among the millions of Ukrainians who left the country to find work and opportunity abroad.
  The continuation into the new century of the chaotic fallout from the collapse of the Soviet Union was symbolized for many in Dnipropetrovsk by two violent episodes. In June and July 2007, Dnipropetrovsk experienced a wave of random video-recorded serial killings that were dubbed by the media as the work of the "Dnipropetrovsk maniacs". In February 2009, three youths were sentenced for their part in 21 murders, and numerous other attacks and robberies. On 27 April 2012, four bombs exploded near four tram stations in Dnipropetrovsk, injuring 27 people. No one was convicted. Opposition politicians claimed to see the hand of President Viktor Yanukovych intent on disrupting the October 2012 Ukrainian parliamentary election and installing a presidential regime.