-96.56% is the change from 610 to 21
Calculation steps:
[( 21 - 610 ) ÷ 610] x 100 = -96.56%
Formula
Percentage change = [(21 - 610) / 610] x 100
Subtract the new number by the original number
21 - 610 = -589
-589 ÷ 610 = -0.9655737704918033
-0.9655737704918033 x 100 = -96.56%