Steve Stedman some numbers:
Here listed is the current percentages of SQL server versions running our Daily Check-up with Database Health Monitor.
Do note that the population for this is “People who use Steve Steadman’s SQL Daily Checkup product” and not organizations which use SQL Server as a whole, so it’s not wise to apply findings from the first directly onto the second. That said, it doesn’t surprise me that 2016 is the most in-use version of SQL Server in this sample. It’s a little surprising how many 2014 instances there are, but that might be related to cardinality estimator changes.