-19.15% is the change from 851 to 688
Calculation steps:
[( 688 - 851 ) ÷ 851] x 100 = -19.15%
Formula
Percentage change = [(688 - 851) / 851] x 100
Subtract the new number by the original number
688 - 851 = -163
-163 ÷ 851 = -0.19153936545240893
-0.19153936545240893 x 100 = -19.15%