-96.22% is the change from 555 to 21
Calculation steps:
[( 21 - 555 ) ÷ 555] x 100 = -96.22%
Formula
Percentage change = [(21 - 555) / 555] x 100
Subtract the new number by the original number
21 - 555 = -534
-534 ÷ 555 = -0.9621621621621622
-0.9621621621621622 x 100 = -96.22%