Your math is wrong at least for Biden, I didn't recheck the others. Biden has 1736 pardons commuted or granted in 46.5 months or 37 pardons per month. I suspect all your other ones are wrong since Biden was so off. The recent trend is Biden and Obama being "off the charts" compared to the republican presidents. From my understanding this is due to weed related charges where they did mass pardonings. It's besides the point ones feelings about it, just commenting on the math.