-10.63% is the change from 715 to 639
Calculation steps:
[( 639 - 715 ) ÷ 715] x 100 = -10.63%
Formula
Percentage change = [(639 - 715) / 715] x 100
Subtract the new number by the original number
639 - 715 = -76
-76 ÷ 715 = -0.1062937062937063
-0.1062937062937063 x 100 = -10.63%