I was wondering if I can find somewhere the temporal evolution of statistics on site usage (number of visits, answered question and the rest). I have been away for some time and the site seems quieter than it used to be. I was wondering if this is real or it was just me.
We recently launched the "access to site analytics" privilege, which lets you do just that.
On beta sites, this privilege is accessible to users with >= 5K reputation on the site (you can track your progress here) (it's raised to 25K afterwards).
There are quite a few users with 5K rep on Chess Stack Exchange. One of them might want to share some of this data with you!