Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Passage: The principal Treaties that form the European Union began with common rules for coal and steel, and then atomic energy, but more complete and formal institutions were established through the Treaty of Rome 1957 and the Maastricht Treaty 1992 (now: TFEU). Minor amendments were made during the 1960s and 1970s. Major amending treaties were signed to complete the development of a single, internal market in the Single European Act 1986, to further the development of a more social Europe in the Treaty of Amsterdam 1997, and to make minor amendments to the relative power of member states in the EU institutions in the Treaty of Nice 2001 and the Treaty of Lisbon 2007. Since its establishment, more member states have joined through a series of accession treaties, from the UK, Ireland, Denmark and Norway in 1972 (though Norway did not end up joining), Greece in 1979, Spain and Portugal 1985, Austria, Finland, Norway and Sweden in 1994 (though again Norway failed to join, because of lack of support in the referendum), the Czech Republic, Cyprus, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia and Slovenia in 2004, Romania and Bulgaria in 2007 and Croatia in 2013. Greenland signed a Treaty in 1985 giving it a special status. Question: When was the Single European Act made?
1986

Passage: The first Methodist clergy were ordained by John Wesley, a priest of the Church of England, because of the crisis caused by the American Revolution which isolated the Methodists in the States from the Church of England and its sacraments. Today, the clergy includes men and women who are ordained by bishops as elders and deacons and are appointed to various ministries. Elders in the United Methodist Church itenerate and are subject to the authority and appointment of their bishops. They generally serve as pastors in local congregations. Deacons are in service ministry and may serve as musicians, liturgists, educators, business administrators, and a number of other areas. Elders and deacons are required to obtain a master's degree (generally an M.Div.), or another equivalent degree, before commissioning and then ultimately ordination. Elders in full connection are each a member of their Annual Conference Order of Elders. Likewise each deacon in full connection is a member of their Annual Conference Order of Deacons. Question: Clergy usually serve as what in local congregations?
pastors

Passage: Construction is the process of constructing a building or infrastructure. Construction differs from manufacturing in that manufacturing typically involves mass production of similar items without a designated purchaser, while construction typically takes place on location for a known client. Construction as an industry comprises six to nine percent of the gross domestic product of developed countries. Construction starts with planning,[citation needed] design, and financing and continues until the project is built and ready for use. Question: What typically involves mass production of similar items without a designated purchaser?
manufacturing