-32.63% is the change from 521 to 351
Calculation steps:
[( 351 - 521 ) ÷ 521] x 100 = -32.63%
Formula
Percentage change = [(351 - 521) / 521] x 100
Subtract the new number by the original number
351 - 521 = -170
-170 ÷ 521 = -0.32629558541266795
-0.32629558541266795 x 100 = -32.63%