-97.07% is the change from 649 to 19
Calculation steps:
[( 19 - 649 ) ÷ 649] x 100 = -97.07%
Formula
Percentage change = [(19 - 649) / 649] x 100
Subtract the new number by the original number
19 - 649 = -630
-630 ÷ 649 = -0.9707241910631741
-0.9707241910631741 x 100 = -97.07%