-21.71% is the change from 668 to 523
Calculation steps:
[( 523 - 668 ) ÷ 668] x 100 = -21.71%
Formula
Percentage change = [(523 - 668) / 668] x 100
Subtract the new number by the original number
523 - 668 = -145
-145 ÷ 668 = -0.21706586826347304
-0.21706586826347304 x 100 = -21.71%