The current collective agreement is:
Previous collective agreements were:
- 2021 January 01 to 2023 December 31
- 2018 January 01 to 2020 December 31
- 2016 July 01 to 2017 December 31
- 2014 July 01 to 2016 June 30
- 2011 July 01 to 2014 June 30
- 2006 July 01 to 2011 June 30
- 2003 July 1 to 2006 June 30
- 2000 July 01 to 2003 June 30
- 1997 September 1 to 2000 June 30
- 1995 July 1 to 1997 August 31
- 1993 July 1 to 1995 June 30