-97.01% is the change from 635 to 19
Calculation steps:
[( 19 - 635 ) ÷ 635] x 100 = -97.01%
Formula
Percentage change = [(19 - 635) / 635] x 100
Subtract the new number by the original number
19 - 635 = -616
-616 ÷ 635 = -0.9700787401574803
-0.9700787401574803 x 100 = -97.01%