-50.56% is the change from 621 to 307
Calculation steps:
[( 307 - 621 ) ÷ 621] x 100 = -50.56%
Formula
Percentage change = [(307 - 621) / 621] x 100
Subtract the new number by the original number
307 - 621 = -314
-314 ÷ 621 = -0.5056360708534622
-0.5056360708534622 x 100 = -50.56%