Notes
1. This electoral symmetry does not necessarily extend to governments. Often one party may be in government at national or regional level, while its sister party remains in opposition. Between 2009 and 2014, Ecolo participated in the Brussels and Walloon regional governments, with two ministers in the Walloon regional cabinet (with large portfolios that included environment, energy, mobility urban planning, research, public administration, and housing) and two ministers in the Brussels regional cabinet (with portfolios of environment, energy, and housing). In the same period, Groen stood in opposition to the Flemish regional government but participated in the Brussels regional cabinet with one junior minister (public administration, mobility, and equality). At federal level, Groen and Ecolo have been in opposition since 2003.