Tornadoes vary pretty wildly from year to year. Some years can have relatively few, and some can have hundreds.
The other variable, of course, is population. The Great Plains, where most tornadoes occur, are relatively unpopulated. When an F5 tornado touches down on a farmer’s 1000-acre field, only his and his neighbors’ crops are ruined (maybe their houses as well) and you won’t even hear about it. Just another isolated disaster for one or two families.
But when an F5 touches down in a populated area, then it’s widespread disaster, damage in the hundreds of millions, and many lives affected.
No one has shown a strong correlation between “climate change” and “storm frequency or strength”. In fact, it seems that tornado frequency has been on a general downward slope for several decades, and no one can really explain that, either.
What is indisputable is that “loss of life” is way down year by year, because of better predictive and warning capability and better building materials and techniques (but mostly the former).