-24.29% is the change from 815 to 617
Calculation steps:
[( 617 - 815 ) ÷ 815] x 100 = -24.29%
Formula
Percentage change = [(617 - 815) / 815] x 100
Subtract the new number by the original number
617 - 815 = -198
-198 ÷ 815 = -0.24294478527607363
-0.24294478527607363 x 100 = -24.29%