-80.52% is the change from 621 to 121
Calculation steps:
[( 121 - 621 ) ÷ 621] x 100 = -80.52%
Formula
Percentage change = [(121 - 621) / 621] x 100
Subtract the new number by the original number
121 - 621 = -500
-500 ÷ 621 = -0.8051529790660226
-0.8051529790660226 x 100 = -80.52%