I did not look back beyond 2011, but almost every year 2011-2021 the Broncos have had at least one undrafted free agent player make the 53-man roster. This string was sort of broken in 2015 when two guys made the practice squad out of camp and neither appeared in a game in the 2015 season (but both played for the Broncos in 2016 and 2017). I like saying 2015 counts because it makes a better story, but even if you don’t count it, ten out of eleven years is still pretty good.
You could look at the Bronco UDCFA success in one of two ways.