-7.65% is the change from 693 to 640
Calculation steps:
[( 640 - 693 ) ÷ 693] x 100 = -7.65%
Formula
Percentage change = [(640 - 693) / 693] x 100
Subtract the new number by the original number
640 - 693 = -53
-53 ÷ 693 = -0.07647907647907648
-0.07647907647907648 x 100 = -7.65%