-37.81% is the change from 521 to 324
Calculation steps:
[( 324 - 521 ) ÷ 521] x 100 = -37.81%
Formula
Percentage change = [(324 - 521) / 521] x 100
Subtract the new number by the original number
324 - 521 = -197
-197 ÷ 521 = -0.3781190019193858
-0.3781190019193858 x 100 = -37.81%