-41% is the change from 539 to 318
Calculation steps:
[( 318 - 539 ) ÷ 539] x 100 = -41%
Formula
Percentage change = [(318 - 539) / 539] x 100
Subtract the new number by the original number
318 - 539 = -221
-221 ÷ 539 = -0.4100185528756957
-0.4100185528756957 x 100 = -41%