-97.17% is the change from 637 to 18
Calculation steps:
[( 18 - 637 ) ÷ 637] x 100 = -97.17%
Formula
Percentage change = [(18 - 637) / 637] x 100
Subtract the new number by the original number
18 - 637 = -619
-619 ÷ 637 = -0.9717425431711146
-0.9717425431711146 x 100 = -97.17%