-6.92% is the change from 549 to 511
Calculation steps:
[( 511 - 549 ) ÷ 549] x 100 = -6.92%
Formula
Percentage change = [(511 - 549) / 549] x 100
Subtract the new number by the original number
511 - 549 = -38
-38 ÷ 549 = -0.0692167577413479
-0.0692167577413479 x 100 = -6.92%