2023 Washington Code 51.18.040 – Retrospective rating groups — Industry and business categories

2022 Washington Code 51.18.040 – Retrospective rating groups–Industry and business categories

2020 Washington Code 51.18.040 – Retrospective rating groups — Industry and business categories

2019 Washington Code 51.18.040

2018 Washington Code 51.18.040 – Retrospective rating groups — Industry and business categories

2016 Washington Code 51.18.040 – Retrospective rating groups–Industry and business categories

2015 Washington Code 51.18.040 – Retrospective rating groups–Industry and business categories

2014 Washington Code 51.18.040 – Retrospective rating groups — Industry and business categories

2013 Washington Code 51.18.040 – Retrospective rating groups — Industry and business categories

2009 Washington Code 51.18.040 – Retrospective rating groups — Industry and business categories