-34.93% is the change from 521 to 339
Calculation steps:
[( 339 - 521 ) ÷ 521] x 100 = -34.93%
Formula
Percentage change = [(339 - 521) / 521] x 100
Subtract the new number by the original number
339 - 521 = -182
-182 ÷ 521 = -0.3493282149712092
-0.3493282149712092 x 100 = -34.93%