Median coin size

I was just wondering, what range of sizes do you think a majority of the world's coins fall into?

I got a lot of random world coins recently, so I've been putting them in mylar flips. But interestingly, my 25mm flips (which I use to store coins between 21-25mm) are being used at like 3 - 4 times the rate of my other different sized flips.

Here's the statistics from Numista on different sizes,



Looks like Maximum are from size 20-30 mm

I think most common size is the shilling sized coin.  French franc, German mark, Italian lira, USA and Canada quarter dollar, UK, AUS, NZ etc shillings are all about the same size.