-91.14% is the change from 971 to 86
Calculation steps:
[( 86 - 971 ) ÷ 971] x 100 = -91.14%
Formula
Percentage change = [(86 - 971) / 971] x 100
Subtract the new number by the original number
86 - 971 = -885
-885 ÷ 971 = -0.9114315139031925
-0.9114315139031925 x 100 = -91.14%