-17.47% is the change from 521 to 430
Calculation steps:
[( 430 - 521 ) ÷ 521] x 100 = -17.47%
Formula
Percentage change = [(430 - 521) / 521] x 100
Subtract the new number by the original number
430 - 521 = -91
-91 ÷ 521 = -0.1746641074856046
-0.1746641074856046 x 100 = -17.47%