-57.25% is the change from 517 to 221
Calculation steps:
[( 221 - 517 ) ÷ 517] x 100 = -57.25%
Formula
Percentage change = [(221 - 517) / 517] x 100
Subtract the new number by the original number
221 - 517 = -296
-296 ÷ 517 = -0.5725338491295938
-0.5725338491295938 x 100 = -57.25%