-83.62% is the change from 525 to 86
Calculation steps:
[( 86 - 525 ) ÷ 525] x 100 = -83.62%
Formula
Percentage change = [(86 - 525) / 525] x 100
Subtract the new number by the original number
86 - 525 = -439
-439 ÷ 525 = -0.8361904761904762
-0.8361904761904762 x 100 = -83.62%