-2.88% is the change from 659 to 640
Calculation steps:
[( 640 - 659 ) ÷ 659] x 100 = -2.88%
Formula
Percentage change = [(640 - 659) / 659] x 100
Subtract the new number by the original number
640 - 659 = -19
-19 ÷ 659 = -0.028831562974203338
-0.028831562974203338 x 100 = -2.88%