-33.01% is the change from 521 to 349
Calculation steps:
[( 349 - 521 ) ÷ 521] x 100 = -33.01%
Formula
Percentage change = [(349 - 521) / 521] x 100
Subtract the new number by the original number
349 - 521 = -172
-172 ÷ 521 = -0.33013435700575816
-0.33013435700575816 x 100 = -33.01%