-77.79% is the change from 815 to 181
Calculation steps:
[( 181 - 815 ) ÷ 815] x 100 = -77.79%
Formula
Percentage change = [(181 - 815) / 815] x 100
Subtract the new number by the original number
181 - 815 = -634
-634 ÷ 815 = -0.7779141104294478
-0.7779141104294478 x 100 = -77.79%