-96.42% is the change from 642 to 23
Calculation steps:
[( 23 - 642 ) ÷ 642] x 100 = -96.42%
Formula
Percentage change = [(23 - 642) / 642] x 100
Subtract the new number by the original number
23 - 642 = -619
-619 ÷ 642 = -0.9641744548286605
-0.9641744548286605 x 100 = -96.42%