-37.2% is the change from 621 to 390
Calculation steps:
[( 390 - 621 ) ÷ 621] x 100 = -37.2%
Formula
Percentage change = [(390 - 621) / 621] x 100
Subtract the new number by the original number
390 - 621 = -231
-231 ÷ 621 = -0.3719806763285024
-0.3719806763285024 x 100 = -37.2%