-18.06% is the change from 670 to 549
Calculation steps:
[( 549 - 670 ) ÷ 670] x 100 = -18.06%
Formula
Percentage change = [(549 - 670) / 670] x 100
Subtract the new number by the original number
549 - 670 = -121
-121 ÷ 670 = -0.18059701492537314
-0.18059701492537314 x 100 = -18.06%