-23.07% is the change from 646 to 497
Calculation steps:
[( 497 - 646 ) ÷ 646] x 100 = -23.07%
Formula
Percentage change = [(497 - 646) / 646] x 100
Subtract the new number by the original number
497 - 646 = -149
-149 ÷ 646 = -0.2306501547987616
-0.2306501547987616 x 100 = -23.07%