-19.05% is the change from 378 to 306
Calculation steps:
[( 306 - 378 ) ÷ 378] x 100 = -19.05%
Formula
Percentage change = [(306 - 378) / 378] x 100
Subtract the new number by the original number
306 - 378 = -72
-72 ÷ 378 = -0.19047619047619047
-0.19047619047619047 x 100 = -19.05%