-91.12% is the change from 991 to 88
Calculation steps:
[( 88 - 991 ) ÷ 991] x 100 = -91.12%
Formula
Percentage change = [(88 - 991) / 991] x 100
Subtract the new number by the original number
88 - 991 = -903
-903 ÷ 991 = -0.9112008072653885
-0.9112008072653885 x 100 = -91.12%
Example