-48.95% is the change from 621 to 317
Calculation steps:
[( 317 - 621 ) ÷ 621] x 100 = -48.95%
Formula
Percentage change = [(317 - 621) / 621] x 100
Subtract the new number by the original number
317 - 621 = -304
-304 ÷ 621 = -0.4895330112721417
-0.4895330112721417 x 100 = -48.95%