-67.76% is the change from 642 to 207
Calculation steps:
[( 207 - 642 ) ÷ 642] x 100 = -67.76%
Formula
Percentage change = [(207 - 642) / 642] x 100
Subtract the new number by the original number
207 - 642 = -435
-435 ÷ 642 = -0.677570093457944
-0.677570093457944 x 100 = -67.76%