-16.51% is the change from 521 to 435
Calculation steps:
[( 435 - 521 ) ÷ 521] x 100 = -16.51%
Formula
Percentage change = [(435 - 521) / 521] x 100
Subtract the new number by the original number
435 - 521 = -86
-86 ÷ 521 = -0.16506717850287908
-0.16506717850287908 x 100 = -16.51%