-70.09% is the change from 642 to 192
Calculation steps:
[( 192 - 642 ) ÷ 642] x 100 = -70.09%
Formula
Percentage change = [(192 - 642) / 642] x 100
Subtract the new number by the original number
192 - 642 = -450
-450 ÷ 642 = -0.7009345794392523
-0.7009345794392523 x 100 = -70.09%