-30.51% is the change from 449 to 312
Calculation steps:
[( 312 - 449 ) ÷ 449] x 100 = -30.51%
Formula
Percentage change = [(312 - 449) / 449] x 100
Subtract the new number by the original number
312 - 449 = -137
-137 ÷ 449 = -0.3051224944320713
-0.3051224944320713 x 100 = -30.51%