[Tilesathome] I'd like a list of the file size of all z12 tilesets

[Ævar Arnfjörð Bjarmason]

I want to play with producing a heat map of the globe where "heat" is
determined by the relative size of t at h tilesets at z12.

I could also use the tiles themselves, but I suppose the tilesets will
be a better indicator of complexity. But whatever's easy.

Could someone with access to the t at h servers pretty please generate
this for me? :)