-67.91% is the change from 642 to 206
Calculation steps:
[( 206 - 642 ) ÷ 642] x 100 = -67.91%
Formula
Percentage change = [(206 - 642) / 642] x 100
Subtract the new number by the original number
206 - 642 = -436
-436 ÷ 642 = -0.6791277258566978
-0.6791277258566978 x 100 = -67.91%