Some of the Multiple Victim Public Shootings in Europe
One has to understand that this data on gun ownership rates per hundred people is from the Small Arms Survey, a group closely linked with George Soros. If you look at their website, you will see that they reference Open Society publications and the work of gun abolishionist Wendy Cukier. As if that wasn't enough of a warning, look at their statement of purpose: "The proliferation of small arms and light weapons represents a grave threat to human security." To put it mildly, I am very dubious about their data.
In any case, the data in the figure purports to show two things. Civilian guns owned per 100 people is the number shown for each country. Each circle represents a multiple victim public shooting and the number in the circle indicates the number of people killed in the attack. Unfortunately, they seem to have missed some multiple victim public shootings in Europe.