-58.93% is the change from 521 to 214
Calculation steps:
[( 214 - 521 ) ÷ 521] x 100 = -58.93%
Formula
Percentage change = [(214 - 521) / 521] x 100
Subtract the new number by the original number
214 - 521 = -307
-307 ÷ 521 = -0.5892514395393474
-0.5892514395393474 x 100 = -58.93%