How Many Readers Come & Go

Does anyone have any idea how many readers of this forum come and go?  

Sometimes, over the course of a couple years I would like to ask for comments on a piece of equipment, set up, music that I sent a post on a few years back.  My thought is that we would have new blood that might have input that wasn’t around during the initial post (that didn’t get much traction). I also don’t want to be redundant for long term readers.

Any thoughts?