-93.62% is the change from 643 to 41
Calculation steps:
[( 41 - 643 ) ÷ 643] x 100 = -93.62%
Formula
Percentage change = [(41 - 643) / 643] x 100
Subtract the new number by the original number
41 - 643 = -602
-602 ÷ 643 = -0.9362363919129082
-0.9362363919129082 x 100 = -93.62%