-67.6% is the change from 642 to 208
Calculation steps:
[( 208 - 642 ) ÷ 642] x 100 = -67.6%
Formula
Percentage change = [(208 - 642) / 642] x 100
Subtract the new number by the original number
208 - 642 = -434
-434 ÷ 642 = -0.67601246105919
-0.67601246105919 x 100 = -67.6%