-19.58% is the change from 991 to 797
Calculation steps:
[( 797 - 991 ) ÷ 991] x 100 = -19.58%
Formula
Percentage change = [(797 - 991) / 991] x 100
Subtract the new number by the original number
797 - 991 = -194
-194 ÷ 991 = -0.19576185671039353
-0.19576185671039353 x 100 = -19.58%