-16.89% is the change from 521 to 433
Calculation steps:
[( 433 - 521 ) ÷ 521] x 100 = -16.89%
Formula
Percentage change = [(433 - 521) / 521] x 100
Subtract the new number by the original number
433 - 521 = -88
-88 ÷ 521 = -0.1689059500959693
-0.1689059500959693 x 100 = -16.89%