-8.9% is the change from 337 to 307
Calculation steps:
[( 307 - 337 ) ÷ 337] x 100 = -8.9%
Formula
Percentage change = [(307 - 337) / 337] x 100
Subtract the new number by the original number
307 - 337 = -30
-30 ÷ 337 = -0.08902077151335312
-0.08902077151335312 x 100 = -8.9%