-31.18% is the change from 449 to 309
Calculation steps:
[( 309 - 449 ) ÷ 449] x 100 = -31.18%
Formula
Percentage change = [(309 - 449) / 449] x 100
Subtract the new number by the original number
309 - 449 = -140
-140 ÷ 449 = -0.311804008908686
-0.311804008908686 x 100 = -31.18%