-33.21% is the change from 521 to 348
Calculation steps:
[( 348 - 521 ) ÷ 521] x 100 = -33.21%
Formula
Percentage change = [(348 - 521) / 521] x 100
Subtract the new number by the original number
348 - 521 = -173
-173 ÷ 521 = -0.33205374280230326
-0.33205374280230326 x 100 = -33.21%