In order to have a better understanding of the maps userbase, we should add another graph that will show per country maps usage. Even though we could analyse both unique users (unique IP + user agent combination), as well as all tiles, the unique users should be enough for now.
Goal 1: show top 9 countries plus 1 for "other" as lines.
Goal 2: allow drill-down into any country and to select which countries to show
We should probably collect data for both, but only implement goal 1 for now.