-2% is the change from 549 to 538
Calculation steps:
[( 538 - 549 ) ÷ 549] x 100 = -2%
Formula
Percentage change = [(538 - 549) / 549] x 100
Subtract the new number by the original number
538 - 549 = -11
-11 ÷ 549 = -0.020036429872495445
-0.020036429872495445 x 100 = -2%