-21.91% is the change from 849 to 663
Calculation steps:
[( 663 - 849 ) ÷ 849] x 100 = -21.91%
Formula
Percentage change = [(663 - 849) / 849] x 100
Subtract the new number by the original number
663 - 849 = -186
-186 ÷ 849 = -0.21908127208480566
-0.21908127208480566 x 100 = -21.91%