-54.51% is the change from 521 to 237
Calculation steps:
[( 237 - 521 ) ÷ 521] x 100 = -54.51%
Formula
Percentage change = [(237 - 521) / 521] x 100
Subtract the new number by the original number
237 - 521 = -284
-284 ÷ 521 = -0.54510556621881
-0.54510556621881 x 100 = -54.51%