-25.85% is the change from 851 to 631
Calculation steps:
[( 631 - 851 ) ÷ 851] x 100 = -25.85%
Formula
Percentage change = [(631 - 851) / 851] x 100
Subtract the new number by the original number
631 - 851 = -220
-220 ÷ 851 = -0.25851938895417154
-0.25851938895417154 x 100 = -25.85%