-6.38% is the change from 486 to 455
Calculation steps:
[( 455 - 486 ) ÷ 486] x 100 = -6.38%
Formula
Percentage change = [(455 - 486) / 486] x 100
Subtract the new number by the original number
455 - 486 = -31
-31 ÷ 486 = -0.06378600823045268
-0.06378600823045268 x 100 = -6.38%