-27.03% is the change from 851 to 621
Calculation steps:
[( 621 - 851 ) ÷ 851] x 100 = -27.03%
Formula
Percentage change = [(621 - 851) / 851] x 100
Subtract the new number by the original number
621 - 851 = -230
-230 ÷ 851 = -0.2702702702702703
-0.2702702702702703 x 100 = -27.03%