-10.74% is the change from 717 to 640
Calculation steps:
[( 640 - 717 ) ÷ 717] x 100 = -10.74%
Formula
Percentage change = [(640 - 717) / 717] x 100
Subtract the new number by the original number
640 - 717 = -77
-77 ÷ 717 = -0.10739191073919108
-0.10739191073919108 x 100 = -10.74%