-96.57% is the change from 671 to 23
Calculation steps:
[( 23 - 671 ) ÷ 671] x 100 = -96.57%
Formula
Percentage change = [(23 - 671) / 671] x 100
Subtract the new number by the original number
23 - 671 = -648
-648 ÷ 671 = -0.9657228017883756
-0.9657228017883756 x 100 = -96.57%