 Complete the following phrase:  The 2015 Allsvenskan, part of the 2015 Swedish football season was the 91st season of Allsvenskan since its establishment in 1924. The 2015 fixtures were released on 21 January 2015. The season started on 4 April 2015, when BK Häcken visited newly promoted Hammarby IF at Tele2 Arena and ended on 31 October 2015. Malmö FF were the defending champions from the 