-45.49% is the change from 521 to 284
Calculation steps:
[( 284 - 521 ) ÷ 521] x 100 = -45.49%
Formula
Percentage change = [(284 - 521) / 521] x 100
Subtract the new number by the original number
284 - 521 = -237
-237 ÷ 521 = -0.45489443378119004
-0.45489443378119004 x 100 = -45.49%