180 shooters difference between 2015 and 2016 seems like less. I think that was around 7.4 percent lower. Of course I'm using my Walmart calculator so someone would have to check my math.
The best way to do the calculation is go to total targets thrown. The loss of 180 shooters could mean the loss of many more targets than it would seem. Maybe many did not shoot all of the targets that were available. Roger C.