Maybe you think "very easily", but I searched around for 10 minutes unable to find the numerical information required. I had concluded it didn't exist in tabulated form, so thanks for confirming I was wrong - although I'm still not sure if this is accessible via natural links.
What I find bad about that - is that I know my way around a website, and I couldn't find the required information. I found it with ease on other council website suggested in the comments (Lambeth, Gateshead, Birmingham: all 2-3 links deep)
If we want people to look for information on the web rather than blocking council call centres: this website is not the right way.
Plus, you can find it very easily by putting "council tax band" into the search box.