-34.78% is the change from 621 to 405
Calculation steps:
[( 405 - 621 ) ÷ 621] x 100 = -34.78%
Formula
Percentage change = [(405 - 621) / 621] x 100
Subtract the new number by the original number
405 - 621 = -216
-216 ÷ 621 = -0.34782608695652173
-0.34782608695652173 x 100 = -34.78%