-84.06% is the change from 508 to 81
Calculation steps:
[( 81 - 508 ) ÷ 508] x 100 = -84.06%
Formula
Percentage change = [(81 - 508) / 508] x 100
Subtract the new number by the original number
81 - 508 = -427
-427 ÷ 508 = -0.8405511811023622
-0.8405511811023622 x 100 = -84.06%