-26.01% is the change from 646 to 478
Calculation steps:
[( 478 - 646 ) ÷ 646] x 100 = -26.01%
Formula
Percentage change = [(478 - 646) / 646] x 100
Subtract the new number by the original number
478 - 646 = -168
-168 ÷ 646 = -0.26006191950464397
-0.26006191950464397 x 100 = -26.01%