-83.57% is the change from 621 to 102
Calculation steps:
[( 102 - 621 ) ÷ 621] x 100 = -83.57%
Formula
Percentage change = [(102 - 621) / 621] x 100
Subtract the new number by the original number
102 - 621 = -519
-519 ÷ 621 = -0.8357487922705314
-0.8357487922705314 x 100 = -83.57%