2023 Washington Code 50.04.020 – Base year — Alternative base year

2022 Washington Code 50.04.020 – Base year–Alternative base year

2020 Washington Code 50.04.020 – Base year — Alternative base year

2019 Washington Code 50.04.020

2018 Washington Code 50.04.020 – Base year — Alternative base year

2016 Washington Code 50.04.020 – Base year–Alternative base year

2015 Washington Code 50.04.020 – Base year–Alternative base year

2014 Washington Code 50.04.020 – Base year — Alternative base year

2013 Washington Code 50.04.020 – Base year — Alternative base year

2009 Washington Code 50.04.020 – Base year — Alternative base year