-86.9% is the change from 649 to 85
Calculation steps:
[( 85 - 649 ) ÷ 649] x 100 = -86.9%
Formula
Percentage change = [(85 - 649) / 649] x 100
Subtract the new number by the original number
85 - 649 = -564
-564 ÷ 649 = -0.8690292758089369
-0.8690292758089369 x 100 = -86.9%