Volume data on median sales graph

[KittenOnCatnip]

The data is already on the page when you hover over a data point but its pretty annoying to if you're trying to see it over a long time

example:

[gergelyszabo94]

It's a good idea but I don't really use the Steam Market all that much anymoreso I will probably won't work on this. Especially that I believe there is another extension that already does this.