-95.94% is the change from 517 to 21
Calculation steps:
[( 21 - 517 ) ÷ 517] x 100 = -95.94%
Formula
Percentage change = [(21 - 517) / 517] x 100
Subtract the new number by the original number
21 - 517 = -496
-496 ÷ 517 = -0.9593810444874274
-0.9593810444874274 x 100 = -95.94%