This visualization shows the number of Go tournaments in European countries
over the years.
Circle sizes can either represent the relative number of tournaments for
their respective countries only, or they can represent the relative size (on a
quadratic scale) for all countries combined; use the radio buttons to switch
between those two views. Mouse over the country names (or tap on them a mobile
device) to show the absolute numbers. Change the checkboxes to show or hide
tournament classes (classes are explained here).
data is provided by the European Go Database. I will update this
visualization as new data appears there.