-81.56% is the change from 537 to 99
Calculation steps:
[( 99 - 537 ) ÷ 537] x 100 = -81.56%
Formula
Percentage change = [(99 - 537) / 537] x 100
Subtract the new number by the original number
99 - 537 = -438
-438 ÷ 537 = -0.8156424581005587
-0.8156424581005587 x 100 = -81.56%