-97.38% is the change from 688 to 18
Calculation steps:
[( 18 - 688 ) ÷ 688] x 100 = -97.38%
Formula
Percentage change = [(18 - 688) / 688] x 100
Subtract the new number by the original number
18 - 688 = -670
-670 ÷ 688 = -0.9738372093023255
-0.9738372093023255 x 100 = -97.38%