-19.27% is the change from 991 to 800
Calculation steps:
[( 800 - 991 ) ÷ 991] x 100 = -19.27%
Formula
Percentage change = [(800 - 991) / 991] x 100
Subtract the new number by the original number
800 - 991 = -191
-191 ÷ 991 = -0.1927346115035318
-0.1927346115035318 x 100 = -19.27%