-10.88% is the change from 717 to 639
Calculation steps:
[( 639 - 717 ) ÷ 717] x 100 = -10.88%
Formula
Percentage change = [(639 - 717) / 717] x 100
Subtract the new number by the original number
639 - 717 = -78
-78 ÷ 717 = -0.1087866108786611
-0.1087866108786611 x 100 = -10.88%