Here's an interesting & informative three part series with Jon Oliver from 2013 that lays it all out....
Part 1 of the 3 part series:
In the US from 2009-2017 at least 1793 people were shot in mass shootings
In Australia from 2009-2017 ZERO MASS SHOOTINGS
2017 the US had 18 Mass shooting incidents in the one year
America from 2009-2017= At least 173 mass shootings in the US
Australia from 2009-2017= ZERO mass shootings in Australia