-96.41% is the change from 641 to 23
Calculation steps:
[( 23 - 641 ) ÷ 641] x 100 = -96.41%
Formula
Percentage change = [(23 - 641) / 641] x 100
Subtract the new number by the original number
23 - 641 = -618
-618 ÷ 641 = -0.9641185647425897
-0.9641185647425897 x 100 = -96.41%