-2.58% is the change from 659 to 642
Calculation steps:
[( 642 - 659 ) ÷ 659] x 100 = -2.58%
Formula
Percentage change = [(642 - 659) / 659] x 100
Subtract the new number by the original number
642 - 659 = -17
-17 ÷ 659 = -0.025796661608497723
-0.025796661608497723 x 100 = -2.58%