-96.61% is the change from 619 to 21
Calculation steps:
[( 21 - 619 ) ÷ 619] x 100 = -96.61%
Formula
Percentage change = [(21 - 619) / 619] x 100
Subtract the new number by the original number
21 - 619 = -598
-598 ÷ 619 = -0.9660743134087237
-0.9660743134087237 x 100 = -96.61%