How to see changelog for versions other than most recent build?

It seems, from what I can see, that the change log page only shows the changes for the most recent build. How can we see the changes over the course of previous builds so we can know the cumulative result? Could you perhaps keep the history viewable for the customers. I think for those who may not implement every new version it is very important to know all the changes there have been since the version they are using in production to the next version they plan to upgrade to. Please consider this. Thank you.