If you go to the tables in Appendix B of this report you will find run sizes, escapements, and current escapement goals for most WA Chinook and coho stocks. It doesn't show a history of changes in escapement goals over time though, although changes generally are infrequent IMO. You can decide how frequently the goals are met but "most of the time" occurs more often than seldom.


https://www.pcouncil.org/documents/2022/02/review-of-2021-ocean-salmon-fisheries.pdf/