 Complete the following phrase:  In the 2011 snap parliamentary election held on 4 December after the centre-left governing coalition collapsed due to internal conflict and inefficacy in passing meaningful economic reforms, SDS won 26.19 of the vote, gaining 26 seats in the National Assembly, thus making SDS the second-largest parliamentary party after the newly formed centre-left party, Positive Slovenia PS headed by Ljubljana mayor Zoran Janković, which won 28 MPs 28.5 of the total. However, SDS succeeded in forming a ruling four-party coalition government which included the Civic List, New Slovenia, Slovenian Peoples Party, and Democratic Party of Pensioners of Slovenia holding a combined total of 50 out of 90 parliamentary seats some two months after the election after PS failed to form a coalition with a parliamentary majority. The coalition took power amid an alarming economic downturn 