-54.19% is the change from 668 to 306
Calculation steps:
[( 306 - 668 ) ÷ 668] x 100 = -54.19%
Formula
Percentage change = [(306 - 668) / 668] x 100
Subtract the new number by the original number
306 - 668 = -362
-362 ÷ 668 = -0.5419161676646707
-0.5419161676646707 x 100 = -54.19%