-92.9% is the change from 549 to 39
Calculation steps:
[( 39 - 549 ) ÷ 549] x 100 = -92.9%
Formula
Percentage change = [(39 - 549) / 549] x 100
Subtract the new number by the original number
39 - 549 = -510
-510 ÷ 549 = -0.9289617486338798
-0.9289617486338798 x 100 = -92.9%