-50.64% is the change from 624 to 308
Calculation steps:
[( 308 - 624 ) ÷ 624] x 100 = -50.64%
Formula
Percentage change = [(308 - 624) / 624] x 100
Subtract the new number by the original number
308 - 624 = -316
-316 ÷ 624 = -0.5064102564102564
-0.5064102564102564 x 100 = -50.64%