-85.9% is the change from 610 to 86
Calculation steps:
[( 86 - 610 ) ÷ 610] x 100 = -85.9%
Formula
Percentage change = [(86 - 610) / 610] x 100
Subtract the new number by the original number
86 - 610 = -524
-524 ÷ 610 = -0.8590163934426229
-0.8590163934426229 x 100 = -85.9%