-7.93% is the change from 694 to 639
Calculation steps:
[( 639 - 694 ) ÷ 694] x 100 = -7.93%
Formula
Percentage change = [(639 - 694) / 694] x 100
Subtract the new number by the original number
639 - 694 = -55
-55 ÷ 694 = -0.0792507204610951
-0.0792507204610951 x 100 = -7.93%