-51.2% is the change from 627 to 306
Calculation steps:
[( 306 - 627 ) ÷ 627] x 100 = -51.2%
Formula
Percentage change = [(306 - 627) / 627] x 100
Subtract the new number by the original number
306 - 627 = -321
-321 ÷ 627 = -0.5119617224880383
-0.5119617224880383 x 100 = -51.2%