-23.37% is the change from 843 to 646
Calculation steps:
[( 646 - 843 ) ÷ 843] x 100 = -23.37%
Formula
Percentage change = [(646 - 843) / 843] x 100
Subtract the new number by the original number
646 - 843 = -197
-197 ÷ 843 = -0.23368920521945433
-0.23368920521945433 x 100 = -23.37%