-9.1% is the change from 703 to 639
Calculation steps:
[( 639 - 703 ) ÷ 703] x 100 = -9.1%
Formula
Percentage change = [(639 - 703) / 703] x 100
Subtract the new number by the original number
639 - 703 = -64
-64 ÷ 703 = -0.09103840682788052
-0.09103840682788052 x 100 = -9.1%