-81.74% is the change from 991 to 181
Calculation steps:
[( 181 - 991 ) ÷ 991] x 100 = -81.74%
Formula
Percentage change = [(181 - 991) / 991] x 100
Subtract the new number by the original number
181 - 991 = -810
-810 ÷ 991 = -0.8173562058526741
-0.8173562058526741 x 100 = -81.74%