-85.99% is the change from 578 to 81
Calculation steps:
[( 81 - 578 ) ÷ 578] x 100 = -85.99%
Formula
Percentage change = [(81 - 578) / 578] x 100
Subtract the new number by the original number
81 - 578 = -497
-497 ÷ 578 = -0.8598615916955017
-0.8598615916955017 x 100 = -85.99%