-84.94% is the change from 538 to 81
Calculation steps:
[( 81 - 538 ) ÷ 538] x 100 = -84.94%
Formula
Percentage change = [(81 - 538) / 538] x 100
Subtract the new number by the original number
81 - 538 = -457
-457 ÷ 538 = -0.8494423791821561
-0.8494423791821561 x 100 = -84.94%