-51.63% is the change from 521 to 252
Calculation steps:
[( 252 - 521 ) ÷ 521] x 100 = -51.63%
Formula
Percentage change = [(252 - 521) / 521] x 100
Subtract the new number by the original number
252 - 521 = -269
-269 ÷ 521 = -0.5163147792706334
-0.5163147792706334 x 100 = -51.63%