-21.89% is the change from 539 to 421
Calculation steps:
[( 421 - 539 ) ÷ 539] x 100 = -21.89%
Formula
Percentage change = [(421 - 539) / 539] x 100
Subtract the new number by the original number
421 - 539 = -118
-118 ÷ 539 = -0.2189239332096475
-0.2189239332096475 x 100 = -21.89%