-93.1% is the change from 449 to 31
Calculation steps:
[( 31 - 449 ) ÷ 449] x 100 = -93.1%
Formula
Percentage change = [(31 - 449) / 449] x 100
Subtract the new number by the original number
31 - 449 = -418
-418 ÷ 449 = -0.9309576837416481
-0.9309576837416481 x 100 = -93.1%