-36.47% is the change from 521 to 331
Calculation steps:
[( 331 - 521 ) ÷ 521] x 100 = -36.47%
Formula
Percentage change = [(331 - 521) / 521] x 100
Subtract the new number by the original number
331 - 521 = -190
-190 ÷ 521 = -0.3646833013435701
-0.3646833013435701 x 100 = -36.47%