-74.68% is the change from 849 to 215
Calculation steps:
[( 215 - 849 ) ÷ 849] x 100 = -74.68%
Formula
Percentage change = [(215 - 849) / 849] x 100
Subtract the new number by the original number
215 - 849 = -634
-634 ÷ 849 = -0.7467608951707891
-0.7467608951707891 x 100 = -74.68%