Parliament of Australia
From 1901 to 1949, the House consisted of either 74 or 75 members (the Senate had 36). Between 1949 and 1984, it had between 121 and 127 members (the Senate had 60 until 1975, when it increased to 64). In 1977, the High Court ordered that the size of the House be reduced from 127 to 124 members to comply with the nexus provision. In 1984, both the Senate and the House were enlarged; since then the House has had between 148 and 150 members (the Senate has 76).
List of whips in the Australian Senate
The Democratic Labour Party (until 2013 the Democratic "Labor" Party) elected its first whip in 1968, when its membership increased from two to four. The party continued to do so until 1974, when the party lost all its seats at the double dissolution election. The party re-entered the Senate following the 2010 election, but did not have a whip as it only had one senator, who left the party in 2014.
The Palmer United Party won three Senate seats at the 2013 election, the new senators taking their seats on 1 July 2014. Two of the three had left within a year, but the remaining senator retained the position of whip until his defeat in 2016.