-63.53% is the change from 839 to 306
Calculation steps:
[( 306 - 839 ) ÷ 839] x 100 = -63.53%
Formula
Percentage change = [(306 - 839) / 839] x 100
Subtract the new number by the original number
306 - 839 = -533
-533 ÷ 839 = -0.635280095351609
-0.635280095351609 x 100 = -63.53%