-77.06% is the change from 815 to 187
Calculation steps:
[( 187 - 815 ) ÷ 815] x 100 = -77.06%
Formula
Percentage change = [(187 - 815) / 815] x 100
Subtract the new number by the original number
187 - 815 = -628
-628 ÷ 815 = -0.7705521472392638
-0.7705521472392638 x 100 = -77.06%