Math Problem That Has No Trains or Chicago

The years are 2006-2022.  In the period 2006-2017 40.5% of the firearms used cannot accept large capacity magazines.  (Revolvers, single-shot rifles, shotguns.)  How do we determine how many total fatalities are required 2018-2022 to make 85% of fatalities 2006-2022 from LCMs?  Do the math; show your work.

Do your part to destroy Hawaii's 10 round pistol magazine limit.