I also found that issue at our plant. We had the trend reports in a book from our contract pest control, but there was no annual assessment. However, it's an easy thing to solve, as sussykraus said.
In our case, we scheduled a meeting with our pest guy at the end of the year to go over trends, trap effectiveness, etc. Then we simply created and added a document that lists information such as what was discussed, improvement suggestions for the upcoming year and such, and had all parties sign off on it before adding it to the pest control binder. That's what we showed our auditor in January, and it was deemed acceptable. Although, if the pest guy does suggest changes for improvement, you'd want to treat it as a corrective action and document it.
"Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution."- Albert Einstein