-49.6% is the change from 621 to 313
Calculation steps:
[( 313 - 621 ) ÷ 621] x 100 = -49.6%
Formula
Percentage change = [(313 - 621) / 621] x 100
Subtract the new number by the original number
313 - 621 = -308
-308 ÷ 621 = -0.49597423510466987
-0.49597423510466987 x 100 = -49.6%