-5.14% is the change from 642 to 609
Calculation steps:
[( 609 - 642 ) ÷ 642] x 100 = -5.14%
Formula
Percentage change = [(609 - 642) / 642] x 100
Subtract the new number by the original number
609 - 642 = -33
-33 ÷ 642 = -0.0514018691588785
-0.0514018691588785 x 100 = -5.14%