See market data and insights per sub category

Hello,

Previously I had seen that I can view amazon reports about the whole category my product are within. This shows overall refund reasons and rates and general market share for the WHOLE market, not my products but all 100,000's in the category.

I remember amazon sent out an email with this data, a URL link inside. This page was on Seller central but i cannot find it.

Has anyone else viewed this before and know where it is?

Many thanks.