-52.63% is the change from 646 to 306
Calculation steps:
[( 306 - 646 ) ÷ 646] x 100 = -52.63%
Formula
Percentage change = [(306 - 646) / 646] x 100
Subtract the new number by the original number
306 - 646 = -340
-340 ÷ 646 = -0.5263157894736842
-0.5263157894736842 x 100 = -52.63%