-81.13% is the change from 991 to 187
Calculation steps:
[( 187 - 991 ) ÷ 991] x 100 = -81.13%
Formula
Percentage change = [(187 - 991) / 991] x 100
Subtract the new number by the original number
187 - 991 = -804
-804 ÷ 991 = -0.8113017154389506
-0.8113017154389506 x 100 = -81.13%