A few days ago, the Belgian newspaper de standaard published this map depicting the number of bicyle accidents per community in Flanders.
When I saw the map I quickly had to think of this XKCD comic:
Yes, logically most accidents happen in communes with a large population. Normalizing by population seems a sensible thing to do.
Luckily, the map is just a google fusion table, so it was easy grab the data , join some population data to it, and finally make a new map showing the number of accidents per 10.000 inhabitants.
Building this map was very easy. I combined the data using saga gis, converted to topojson using the node scripts. Then I took the very nice interactive chloropleth map from leaflet, changed the datasource, updated the class breaks and colors and finally update the legend.