-96.56% is the change from 668 to 23
Calculation steps:
[( 23 - 668 ) ÷ 668] x 100 = -96.56%
Formula
Percentage change = [(23 - 668) / 668] x 100
Subtract the new number by the original number
23 - 668 = -645
-645 ÷ 668 = -0.9655688622754491
-0.9655688622754491 x 100 = -96.56%