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Just looks like a normal variation to me. Some banner years and some low years appears to be normal.
As I understand it , the chemistry of the water during some critical two week period when the eggs first come out is very critical to the success of a given YOY. If some quirk or pollution makes the PH or othe chemistry detail high during a critical time during the spawning , the numbers crash but if the timing is such that the water is good during the spawn , the numbers boom . It all evens out over a long period. What you need to be careful of is year after year low numbers. A decade of all low numbers and the fishery is crashing.
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