-9.75% is the change from 646 to 583
Calculation steps:
[( 583 - 646 ) ÷ 646] x 100 = -9.75%
Formula
Percentage change = [(583 - 646) / 646] x 100
Subtract the new number by the original number
583 - 646 = -63
-63 ÷ 646 = -0.09752321981424149
-0.09752321981424149 x 100 = -9.75%