-86.47% is the change from 621 to 84
Calculation steps:
[( 84 - 621 ) ÷ 621] x 100 = -86.47%
Formula
Percentage change = [(84 - 621) / 621] x 100
Subtract the new number by the original number
84 - 621 = -537
-537 ÷ 621 = -0.8647342995169082
-0.8647342995169082 x 100 = -86.47%