-97.63% is the change from 549 to 13
Calculation steps:
[( 13 - 549 ) ÷ 549] x 100 = -97.63%
Formula
Percentage change = [(13 - 549) / 549] x 100
Subtract the new number by the original number
13 - 549 = -536
-536 ÷ 549 = -0.97632058287796
-0.97632058287796 x 100 = -97.63%