-12.82% is the change from 991 to 864
Calculation steps:
[( 864 - 991 ) ÷ 991] x 100 = -12.82%
Formula
Percentage change = [(864 - 991) / 991] x 100
Subtract the new number by the original number
864 - 991 = -127
-127 ÷ 991 = -0.12815338042381433
-0.12815338042381433 x 100 = -12.82%