-87.2% is the change from 672 to 86
Calculation steps:
[( 86 - 672 ) ÷ 672] x 100 = -87.2%
Formula
Percentage change = [(86 - 672) / 672] x 100
Subtract the new number by the original number
86 - 672 = -586
-586 ÷ 672 = -0.8720238095238095
-0.8720238095238095 x 100 = -87.2%