-87.28% is the change from 621 to 79
Calculation steps:
[( 79 - 621 ) ÷ 621] x 100 = -87.28%
Formula
Percentage change = [(79 - 621) / 621] x 100
Subtract the new number by the original number
79 - 621 = -542
-542 ÷ 621 = -0.8727858293075684
-0.8727858293075684 x 100 = -87.28%