-83.9% is the change from 534 to 86
Calculation steps:
[( 86 - 534 ) ÷ 534] x 100 = -83.9%
Formula
Percentage change = [(86 - 534) / 534] x 100
Subtract the new number by the original number
86 - 534 = -448
-448 ÷ 534 = -0.8389513108614233
-0.8389513108614233 x 100 = -83.9%