Question: The Mincome experiment occurred during which number prime minister?

Context paragraphs:
Mincome: Mincome was an experimental Canadian guaranteed annual income project that was held in Manitoba, during the 1970s.  The project, funded jointly by the Manitoba provincial government and the Canadian federal government under Prime Minister Pierre Trudeau.  It was launched with a news release on February 22, 1974, under the New Democratic Party government of Edward Schreyer, and was closed down in 1979 under the Progressive Conservative government of Sterling Lyon and the federal Progressive Conservative Party of Joe Clark.  The purpose of this experiment was to assess the social impact of a guaranteed, unconditional annual income, including whether a program of this nature would cause disincentives to work for the recipients and how great such a disincentive would be.

List of Prime Ministers of Canada: The Prime Minister of Canada is an official who serves as the primary minister of the Crown, chair of the Cabinet, and thus head of government of Canada.  Officially, the prime minister is appointed by the Governor General of Canada, but by constitutional convention, the prime minister must have the confidence of the elected House of Commons.  Normally, this is the leader of the party caucus with the greatest number of seats in the house.  But, if that leader lacks support of the majority, the governor general can appoint another leader who has that support or may dissolve parliament and call a new election.  By constitutional convention, a prime minister holds a seat in parliament and, since the early 20th century, this has more specifically meant the House of Commons.

Deputy Prime Minister of the Republic of Poland: Deputy Prime Minister of the Republic of Poland is the deputy of the Prime Minister of Poland and member of the Council of Ministers of the Republic of Poland.  They can also be one of the Ministers of the Republic of Poland.  The Constitution of the Republic does not limit the number of persons who can hold the position of deputy prime minister simultaneously.  As of November 2015, Piotr Gliński, minister of culture and national heritage, Jarosław Gowin, minister of science and higher education and Mateusz Morawiecki, minister of development are the persons holding this office.

Pierre Trudeau: Joseph Philippe Pierre Yves Elliott Trudeau, ( ; ] ; October 18, 1919 – September 28, 2000), often referred to by the initials PET, was a Canadian statesman who served as the 15th Prime Minister of Canada (1968–1979 and 1980–1984).  He is the 3rd longest-serving Prime Minister in Canadian history (behind William Lyon Mackenzie King and John A. Macdonald), having served for 15 years, 164 days.

Ahmed Maiteeq: Ahmed Omar Maiteeq is a Libyan businessman and politician, originally from Misrata, who was elected Prime Minister of Libya in May 2014.  His election as prime minister took place under disputed circumstances.  The Justice Ministry decided on 29 May that Maiteeq was not the Prime Minister due to voting procedural issue occurred when the First Deputy of GNC left the session without valid reason.  The Libyan Supreme Court was expected to issue a verdict on 5 June 2014 regarding the election of Maiteeq, although it indicated on that day that it believed that the appointment of Maiteeq was invalid, the court stated that appeals should be heard and delayed a final ruling until 9 June.  The court ruled on 9 June that Maiteeq appointment was invalid;

Deputy prime minister: A deputy prime minister or vice prime minister is, in some countries, a government minister who can take the position of acting prime minister when the prime minister is temporarily absent.  The position is often likened to that of a vice president, but is significantly different even though both positions are "number two" offices.  The position of deputy prime minister should not be confused with the Canadian Deputy Minister of the Prime Minister of Canada, a nonpolitical civil servant position.  Also, the Deputy Prime Minister of Canada does not act as a "number two".

Edi Rama: Edi Rama (] ; born 4 July 1964) is an Albanian politician, diplomat, artist, writer and former basketball player, who has been the Prime Minister of Albania since 2013.  He is also the first serving Mayor to become Prime Minister.  Rama is since 2005 a member and leader of the Socialist Party.  Before his election as Prime Minister, Rama held a number of governmental and diplomatic positions.  Namely, he previously served as the Minister of Culture, Youth and Sports from 1998 to 2000.  Afterwards he became the Mayor of Tirana for at least three-consecutive-terms from 2000 to 2011.

Deputy Prime Minister of Croatia: The Deputy Prime Minister of Croatia (officially the Vice President of the Government of the Republic of Croatia (Croatian: "Potpredsjednik/ Potpredsjednica Vlade Republike Hrvatske" )), is the official Deputy of the Prime Minister of Croatia.  Article 109 of the Constitution of Croatia states that the cabinet is to be made up of the Prime Minister, one or more Deputy Prime Ministers and other cabinet ministers.  According to convention, if the governing parliamentary majority is a coalition of parties, all junior partners in the coalition will usually be given one Deputy Prime Minister in the cabinet, with their rank usually being determined by the number of MPs the party has in Parliament.  The Deputy Prime Ministers are permitted to simultaneously hold a ministerial portfolio while in office, but may also serve without holding such a portfolio.

Prime Minister's Resignation Honours: The Prime Minister's Resignation Honours in the United Kingdom are honours granted at the behest of an outgoing Prime Minister following his or her resignation.  In such a list, a prime minister may ask the monarch to bestow peerages, or lesser honours, on any number of people of his or her choosing.  For example, in the 1997 Prime Minister's Resignation Honours, an additional 47 working peers were created at the behest of the three main parties.

Australian Labor Party leadership spill, 2010: The Australian Labor Party leadership spill, 2010 occurred on 24 June 2010.  Kevin Rudd, the Prime Minister of Australia, was challenged by Julia Gillard, the Deputy Prime Minister of Australia, for the leadership of the Australian Labor Party.  Gillard won the election unopposed after Rudd declined to contest, choosing instead to resign.  Gillard was duly sworn in as Prime Minister by Quentin Bryce, the Governor-General, on 24 June 2010 at Government House, becoming Australia's first female Prime Minister.

Supporting paragraphs: Mincome Pierre Trudeau
Answer: 15th