From the Crime Prevention Research Center:
The U.S. is well below the world average in terms of the number of mass public shootings, and the global increase over time has been much bigger than for the United States.
Over the 18 years from 1998 to 2015, our list contains 2,354 attacks and at least 4,880 shooters outside the United States and 53 attacks and 57 shooters within our country. By our count, the US makes up less than 1.15% of the mass public shooters, 1.49% of their murders, and 2.20% of their attacks. All these are much less than the US’s 4.6% share of the world population. Attacks in the US are not only less frequent than other countries, they are also much less deadly on average.
Out of the 97 countries where we have identified mass public shootings occurring, the United States ranks 64th in the per capita frequency of these attacks and 65th in the murder rate.
Not only have these attacks been much more common outside the US, the US’s share of these attacks have declined over time. There has been a much bigger increase over time in the number and severity of mass shootings in the rest of the world compared to the US.