-18.06% is the change from 991 to 812
Calculation steps:
[( 812 - 991 ) ÷ 991] x 100 = -18.06%
Formula
Percentage change = [(812 - 991) / 991] x 100
Subtract the new number by the original number
812 - 991 = -179
-179 ÷ 991 = -0.18062563067608475
-0.18062563067608475 x 100 = -18.06%