-3.3% is the change from 455 to 440
Calculation steps:
[( 440 - 455 ) ÷ 455] x 100 = -3.3%
Formula
Percentage change = [(440 - 455) / 455] x 100
Subtract the new number by the original number
440 - 455 = -15
-15 ÷ 455 = -0.03296703296703297
-0.03296703296703297 x 100 = -3.3%