-91.1% is the change from 966 to 86
Calculation steps:
[( 86 - 966 ) ÷ 966] x 100 = -91.1%
Formula
Percentage change = [(86 - 966) / 966] x 100
Subtract the new number by the original number
86 - 966 = -880
-880 ÷ 966 = -0.9109730848861284
-0.9109730848861284 x 100 = -91.1%