-34.57% is the change from 81 to 53
Calculation steps:
[( 53 - 81 ) ÷ 81] x 100 = -34.57%
Formula
Percentage change = [(53 - 81) / 81] x 100
Subtract the new number by the original number
53 - 81 = -28
-28 ÷ 81 = -0.345679012345679
-0.345679012345679 x 100 = -34.57%