"A more important oversight was the report's use of average deaths per capita instead of a more stable metric. Because of the smaller populations of most Europe

"A more important oversight was the report's use of average deaths per capita instead of a more stable metric. Because of the smaller populations of most European countries, individual events in those countries had statistically oversized influence and warped the results. For example, Norway’s world-leading annual rate was due to a single devastating 2011 event, in which far-right extremist Anders Behring Breivik gunned down 69 people at a summer camp on the island of Utøya. Norway had zero mass shootings in 2009, 2010, 2012, 2013, 2014, and 2015."