-31.15% is the change from 549 to 378
Calculation steps:
[( 378 - 549 ) ÷ 549] x 100 = -31.15%
Formula
Percentage change = [(378 - 549) / 549] x 100
Subtract the new number by the original number
378 - 549 = -171
-171 ÷ 549 = -0.3114754098360656
-0.3114754098360656 x 100 = -31.15%