It probably won't surprise many people to learn that the Spurs came out on top in this experiment. What might/probably will surprise people is the margin of victory. To put things into perspective, the gap between the Spurs and #2 Mavs is greater than the gap between the Mavs and last place Knicks It's hard to even wrap my mind around that.
FWIW I excluded the Bobcats/modern Hornets because they only played 15 of the 20 seasons. If you extrapolate their average win total over that span it's actually less than the Knicks, but then this thread would be slightly less mind blowing.
Ugh, data input error on my part. Corrections have been made in the below win counts. Figures the Spurs were the only team I made a significant error on Obviously still very impressive, but the cool fact no longer holds. We'll have to settle for the gap between the Spurs/Mavs > Mavs/Sixers (#21 on the list).
Full results: