Created due to the fact I couldn't find a percentage measure of average change when searching for it.
I have very little coding experience in Pine or otherwise so feel free to take and edit the script to make it a bit more user friendly.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.