-69.63% is the change from 642 to 195
Calculation steps:
[( 195 - 642 ) ÷ 642] x 100 = -69.63%
Formula
Percentage change = [(195 - 642) / 642] x 100
Subtract the new number by the original number
195 - 642 = -447
-447 ÷ 642 = -0.6962616822429907
-0.6962616822429907 x 100 = -69.63%