-70.25% is the change from 642 to 191
Calculation steps:
[( 191 - 642 ) ÷ 642] x 100 = -70.25%
Formula
Percentage change = [(191 - 642) / 642] x 100
Subtract the new number by the original number
191 - 642 = -451
-451 ÷ 642 = -0.7024922118380063
-0.7024922118380063 x 100 = -70.25%