-51.73% is the change from 520 to 251
Calculation steps:
[( 251 - 520 ) ÷ 520] x 100 = -51.73%
Formula
Percentage change = [(251 - 520) / 520] x 100
Subtract the new number by the original number
251 - 520 = -269
-269 ÷ 520 = -0.5173076923076924
-0.5173076923076924 x 100 = -51.73%