-91.08% is the change from 964 to 86
Calculation steps:
[( 86 - 964 ) ÷ 964] x 100 = -91.08%
Formula
Percentage change = [(86 - 964) / 964] x 100
Subtract the new number by the original number
86 - 964 = -878
-878 ÷ 964 = -0.9107883817427386
-0.9107883817427386 x 100 = -91.08%