-80.12% is the change from 991 to 197
Calculation steps:
[( 197 - 991 ) ÷ 991] x 100 = -80.12%
Formula
Percentage change = [(197 - 991) / 991] x 100
Subtract the new number by the original number
197 - 991 = -794
-794 ÷ 991 = -0.8012108980827447
-0.8012108980827447 x 100 = -80.12%