-82.09% is the change from 815 to 146
Calculation steps:
[( 146 - 815 ) ÷ 815] x 100 = -82.09%
Formula
Percentage change = [(146 - 815) / 815] x 100
Subtract the new number by the original number
146 - 815 = -669
-669 ÷ 815 = -0.8208588957055215
-0.8208588957055215 x 100 = -82.09%