-63.7% is the change from 843 to 306
Calculation steps:
[( 306 - 843 ) ÷ 843] x 100 = -63.7%
Formula
Percentage change = [(306 - 843) / 843] x 100
Subtract the new number by the original number
306 - 843 = -537
-537 ÷ 843 = -0.6370106761565836
-0.6370106761565836 x 100 = -63.7%