-86.63% is the change from 815 to 109
Calculation steps:
[( 109 - 815 ) ÷ 815] x 100 = -86.63%
Formula
Percentage change = [(109 - 815) / 815] x 100
Subtract the new number by the original number
109 - 815 = -706
-706 ÷ 815 = -0.8662576687116564
-0.8662576687116564 x 100 = -86.63%