-6.38% is the change from 643 to 602
Calculation steps:
[( 602 - 643 ) ÷ 643] x 100 = -6.38%
Formula
Percentage change = [(602 - 643) / 643] x 100
Subtract the new number by the original number
602 - 643 = -41
-41 ÷ 643 = -0.06376360808709176
-0.06376360808709176 x 100 = -6.38%