-69.16% is the change from 642 to 198
Calculation steps:
[( 198 - 642 ) ÷ 642] x 100 = -69.16%
Formula
Percentage change = [(198 - 642) / 642] x 100
Subtract the new number by the original number
198 - 642 = -444
-444 ÷ 642 = -0.6915887850467289
-0.6915887850467289 x 100 = -69.16%