-93.7% is the change from 635 to 40
Calculation steps:
[( 40 - 635 ) ÷ 635] x 100 = -93.7%
Formula
Percentage change = [(40 - 635) / 635] x 100
Subtract the new number by the original number
40 - 635 = -595
-595 ÷ 635 = -0.937007874015748
-0.937007874015748 x 100 = -93.7%