-80.73% is the change from 991 to 191
Calculation steps:
[( 191 - 991 ) ÷ 991] x 100 = -80.73%
Formula
Percentage change = [(191 - 991) / 991] x 100
Subtract the new number by the original number
191 - 991 = -800
-800 ÷ 991 = -0.8072653884964682
-0.8072653884964682 x 100 = -80.73%