Groen’s highpoint was the 1999 elections, where it surged after a scandal with pollutants in chicken. It entered government until 2003, when it lost all its seats in parliament. It returned in 2007 but remained in opposition, though it now has a deal with the government to support it on constitutional reforms.
Groen is a member of the European Green Party (The Greens–European Free). It is loyal in 98.7% of votes.