-9.15% is the change from 645 to 586
Calculation steps:
[( 586 - 645 ) ÷ 645] x 100 = -9.15%
Formula
Percentage change = [(586 - 645) / 645] x 100
Subtract the new number by the original number
586 - 645 = -59
-59 ÷ 645 = -0.09147286821705426
-0.09147286821705426 x 100 = -9.15%