How many school shootings did they have before that?
None. But after gun ban there have been 16 "mass murders" meaning that there has been at least 3 dead, but at the period from 1908 to 1997 only 8 similar cases. Not really such an ultimate success like they try make people to believe. In fact third most devastating mass murder by gun was 2010, three years after gun ban leaving 11 dead and 14 injured.
