-98.7% is the change from 539 to 7
Calculation steps:
[( 7 - 539 ) ÷ 539] x 100 = -98.7%
Formula
Percentage change = [(7 - 539) / 539] x 100
Subtract the new number by the original number
7 - 539 = -532
-532 ÷ 539 = -0.987012987012987
-0.987012987012987 x 100 = -98.7%