2023 Washington Code 51.18.060 – Retrospective rating groups — Department approval

2022 Washington Code 51.18.060 – Retrospective rating groups–Department approval

2020 Washington Code 51.18.060 – Retrospective rating groups — Department approval

2019 Washington Code 51.18.060

2018 Washington Code 51.18.060 – Retrospective rating groups — Department approval

2016 Washington Code 51.18.060 – Retrospective rating groups–Department approval

2015 Washington Code 51.18.060 – Retrospective rating groups–Department approval

2014 Washington Code 51.18.060 – Retrospective rating groups — Department approval

2013 Washington Code 51.18.060 – Retrospective rating groups — Department approval

2009 Washington Code 51.18.060 – Retrospective rating groups — Department approval