^ I would be careful of stats like that are small sample size and not taken even in the same year.
Having said that, doing a little digging I found that over all gun violence in America (from 1980 - present day) has decreased, and also has remained fairly constant since the turn of the millennium.
Also the number of 'mass shooting' events (not necessarily deaths) from 1982 - 2014 has definitely increased in America.
What I was not prepared was to see that in a 6 year sample of mass shooting DEATHS per capita, Americans were not even in the top 10.
(Mass public shootings – defined as four or more people killed in a public place, and not in the course of committing another crime, and not involving struggles over sovereignty. )
A country like Finland, with arms ownership by the population ranging around 30% (like Canada) has a higher rate of mass shooting events deaths per capita than America.
https://en.wikipedia.org/wiki/Estima...ita_by_country
America, with 120% of the country armed (including automatic weapons) would have been EXPECTED to be much higher.
https://fee.org/articles/the-myth-th...ass-shootings/
______________________________________________________________________________________________________
TDLR - American mass shooting events have been on the rise, but the actual gun deaths has been decreasing long term.
With American gun ownership per capita in the 120% level (20% more guns than the entire population) one would have expected the per capita mass shooting deaths to reflect this high number - but thats not the case at all.