-99.68% is the change from 621 to 2
Calculation steps:
[( 2 - 621 ) ÷ 621] x 100 = -99.68%
Formula
Percentage change = [(2 - 621) / 621] x 100
Subtract the new number by the original number
2 - 621 = -619
-619 ÷ 621 = -0.9967793880837359
-0.9967793880837359 x 100 = -99.68%