This is what you are calling essentially flat. This info is from the y-value on the charts.

Skagit) -1.0% per year for 26 years
Snohomish) -4.0% per year for 22 years
Green) -1.6% per year for 26 years
Puyallup) -7.4% per year for 20 years
Quillayute) +2.4% per year for 24 years
Hoh) -0.9% per year for 26 years
Queets) -2.0% per year for 30 years
Quinault) -2.1% per year for 24 years.


If that was your wages instead of fish you might be a little more concerned over a 20+ year "slight" downward trend.