Since 1990, there have been 22 shootings at elementary and secondary schools in which two or more people were killed, not counting those perpetrators who committed suicide.
Whereas five of these incidents have occurred over the past five-plus years since 2013, claiming the lives of 27 victims (17 at Parkland), the latter half of the 1990s witnessed seven multiple-fatality shootings with a total of 33 killed (13 at Columbine).
In fact, the 1997-98 school year was so awful, with four multiple-fatality shooting sprees at the hands of armed students (in Pearl, Miss.; West Paducah, Ky.; Jonesboro, Ark.; and Springfield, Ore.), that then-President Clinton formed a White House expert committee to advise him. Nearly a decade later, President Bush convened a White House Conference on School Safety in the wake of multiple-fatality incidents during his administration.