-97.09% is the change from 687 to 20
Calculation steps:
[( 20 - 687 ) ÷ 687] x 100 = -97.09%
Formula
Percentage change = [(20 - 687) / 687] x 100
Subtract the new number by the original number
20 - 687 = -667
-667 ÷ 687 = -0.9708879184861717
-0.9708879184861717 x 100 = -97.09%