-9.5% is the change from 337 to 305
Calculation steps:
[( 305 - 337 ) ÷ 337] x 100 = -9.5%
Formula
Percentage change = [(305 - 337) / 337] x 100
Subtract the new number by the original number
305 - 337 = -32
-32 ÷ 337 = -0.09495548961424333
-0.09495548961424333 x 100 = -9.5%