-10.68% is the change from 646 to 577
Calculation steps:
[( 577 - 646 ) ÷ 646] x 100 = -10.68%
Formula
Percentage change = [(577 - 646) / 646] x 100
Subtract the new number by the original number
577 - 646 = -69
-69 ÷ 646 = -0.10681114551083591
-0.10681114551083591 x 100 = -10.68%