What would really be informative would be to have a age analysis rather than just looking at escapement. If one assumes 2 fresh 2 salt then looking at the recent data shows most "cycles" declining. In a fish with as complex life history as steelhead (FW can be at least 1-4 and saltwater can be 1-3 or 4) for first-time spawners (before you even get into repeats) it is way too simplistic to just look at un-aged data.