-27.14% is the change from 851 to 620
Calculation steps:
[( 620 - 851 ) ÷ 851] x 100 = -27.14%
Formula
Percentage change = [(620 - 851) / 851] x 100
Subtract the new number by the original number
620 - 851 = -231
-231 ÷ 851 = -0.27144535840188017
-0.27144535840188017 x 100 = -27.14%