-39.12% is the change from 455 to 277
Calculation steps:
[( 277 - 455 ) ÷ 455] x 100 = -39.12%
Formula
Percentage change = [(277 - 455) / 455] x 100
Subtract the new number by the original number
277 - 455 = -178
-178 ÷ 455 = -0.3912087912087912
-0.3912087912087912 x 100 = -39.12%