-73.1% is the change from 539 to 145
Calculation steps:
[( 145 - 539 ) ÷ 539] x 100 = -73.1%
Formula
Percentage change = [(145 - 539) / 539] x 100
Subtract the new number by the original number
145 - 539 = -394
-394 ÷ 539 = -0.7309833024118738
-0.7309833024118738 x 100 = -73.1%