-20.48% is the change from 991 to 788
Calculation steps:
[( 788 - 991 ) ÷ 991] x 100 = -20.48%
Formula
Percentage change = [(788 - 991) / 991] x 100
Subtract the new number by the original number
788 - 991 = -203
-203 ÷ 991 = -0.20484359233097882
-0.20484359233097882 x 100 = -20.48%