-84.92% is the change from 537 to 81
Calculation steps:
[( 81 - 537 ) ÷ 537] x 100 = -84.92%
Formula
Percentage change = [(81 - 537) / 537] x 100
Subtract the new number by the original number
81 - 537 = -456
-456 ÷ 537 = -0.8491620111731844
-0.8491620111731844 x 100 = -84.92%