-13.78% is the change from 646 to 557
Calculation steps:
[( 557 - 646 ) ÷ 646] x 100 = -13.78%
Formula
Percentage change = [(557 - 646) / 646] x 100
Subtract the new number by the original number
557 - 646 = -89
-89 ÷ 646 = -0.13777089783281735
-0.13777089783281735 x 100 = -13.78%