The information starts from when each state or territory held its first election, and continues through to the present day.
The background colour indicates which party won the election.
In addition the federal government have changed to fixed election dates every three years, and both territories and all states except Tasmania have changed to fixed election dates every four years.
For these legislatures, the box is shown as running until the next scheduled election, but one could still be earlier if the government falls due to a motion of no confidence.
"Australian Politics and Elections Database, The University of Western Australia".