-25.97% is the change from 851 to 630
Calculation steps:
[( 630 - 851 ) ÷ 851] x 100 = -25.97%
Formula
Percentage change = [(630 - 851) / 851] x 100
Subtract the new number by the original number
630 - 851 = -221
-221 ÷ 851 = -0.2596944770857814
-0.2596944770857814 x 100 = -25.97%