Passage: The chancellor, Angela Merkel (22 November 2005–present), is the head of government and exercises executive power through their Cabinet, similar to the role of a prime minister in other parliamentary democracies. Federal legislative power is vested in the parliament consisting of the Bundestag (Federal Diet) and Bundesrat (Federal Council), which together form the legislative body. The Bundestag is elected through direct elections, by proportional representation (mixed-member). The members of the Bundesrat represent the governments of the sixteen federated states and are members of the state cabinets.Since 1949, the party system has been dominated by the Christian Democratic Union and the Social Democratic Party of Germany. So far every chancellor has been a member of one of these parties. However, the smaller liberal Free Democratic Party (in parliament from 1949 to 2013 and again since 2017) and the Alliance '90/The Greens (in parliament since 1983) have also played important roles. Since 2005, the left-wing populist party The Left, formed through the merger of two former parties, has been a staple in the German Bundestag though they have never been part of the federal government. In the German federal election, 2017, the right-wing populist Alternative for Germany gained enough votes to attain representation in the parliament for the first time.

Question: When did The Greens first join parliament?
1983