-81.35% is the change from 815 to 152
Calculation steps:
[( 152 - 815 ) ÷ 815] x 100 = -81.35%
Formula
Percentage change = [(152 - 815) / 815] x 100
Subtract the new number by the original number
152 - 815 = -663
-663 ÷ 815 = -0.8134969325153374
-0.8134969325153374 x 100 = -81.35%