The data is for a really arbitrary timespan, why 2000-2014? It’s clearly missing data, Finland for example had more than two mass shootings during those years.

The data is for a really arbitrary timespan, why 2000-2014? It’s clearly missing data, Finland for example had more than two mass shootings during those years. The numbers look bad because they are bad, they may however be bad for different reasons than I originally suggested.