-6.99% is the change from 715 to 665
Calculation steps:
[( 665 - 715 ) ÷ 715] x 100 = -6.99%
Formula
Percentage change = [(665 - 715) / 715] x 100
Subtract the new number by the original number
665 - 715 = -50
-50 ÷ 715 = -0.06993006993006994
-0.06993006993006994 x 100 = -6.99%