Your graph does not show a dynamic average, it shows a static average. There are mathematical tools to show a dynamic average. Why share this static average? It's basically useless imho.
Discussion
Dynamic = moving average. No other sources I know provids all time average. Why not? Because you can look at the 200-day month whatever moving average on your own.
All time static average is a reference point. Not useless overall, but useless to you and that's okay