-9.36% is the change from 705 to 639
Calculation steps:
[( 639 - 705 ) ÷ 705] x 100 = -9.36%
Formula
Percentage change = [(639 - 705) / 705] x 100
Subtract the new number by the original number
639 - 705 = -66
-66 ÷ 705 = -0.09361702127659574
-0.09361702127659574 x 100 = -9.36%