-49.28% is the change from 621 to 315
Calculation steps:
[( 315 - 621 ) ÷ 621] x 100 = -49.28%
Formula
Percentage change = [(315 - 621) / 621] x 100
Subtract the new number by the original number
315 - 621 = -306
-306 ÷ 621 = -0.4927536231884058
-0.4927536231884058 x 100 = -49.28%