-16.12% is the change from 521 to 437
Calculation steps:
[( 437 - 521 ) ÷ 521] x 100 = -16.12%
Formula
Percentage change = [(437 - 521) / 521] x 100
Subtract the new number by the original number
437 - 521 = -84
-84 ÷ 521 = -0.16122840690978887
-0.16122840690978887 x 100 = -16.12%