-19.48% is the change from 539 to 434
Calculation steps:
[( 434 - 539 ) ÷ 539] x 100 = -19.48%
Formula
Percentage change = [(434 - 539) / 539] x 100
Subtract the new number by the original number
434 - 539 = -105
-105 ÷ 539 = -0.19480519480519481
-0.19480519480519481 x 100 = -19.48%