What's even more impressive, statistically speaking, is the extremely low tornado count, which is running near historical lows. The National Weather Service only vouches for numbers since 1950, one of the shortest time-series in U.S. weather and even there caution that many tornadoes were missed early in the official record, until radar tech matured.
The two stats are related of course via that better radar giving more accurate and more timely warnings thus saving lives while at the same time increasing the total number of tornadoes recorded as rural or short-lived twisters that otherwise weren't recorded are now caught in the record.
Here's the recent record with 2018 not only running below the 10-year ('05-'15) average but YTD the lowest this century.
We'll update when the next graph comes out.
And the headline story from USA Today: