Who's Produced the Most Flagship Sets?

Here are some interesting numbers (to me anyway).  I was making a checklist for my Red Sox team set project, attempting to see how many I had and how many more I had to go.  Since 1981, that's 37 years of cards sets now, did you know Topps is the only brand to have a set all 37 years?  For the brands I consider flagship, here's how many years of sets each had in that same timeframe.  (1981-2017)  This is baseball only.

1. Topps - 37
2. Bowman - 29
3. Donruss - 27
4. Fleer - 27 (counting some Fleer Tradition the years there was no Fleer)
5. Upper Deck - 22
6. Leaf - 13 (started counting when it was more than Donruss with a green leaf in the corner)
7. Score - 11
8. Pacific - 9