-86.38% is the change from 991 to 135
Calculation steps:
[( 135 - 991 ) ÷ 991] x 100 = -86.38%
Formula
Percentage change = [(135 - 991) / 991] x 100
Subtract the new number by the original number
135 - 991 = -856
-856 ÷ 991 = -0.863773965691221
-0.863773965691221 x 100 = -86.38%