-10.6% is the change from 670 to 599
Calculation steps:
[( 599 - 670 ) ÷ 670] x 100 = -10.6%
Formula
Percentage change = [(599 - 670) / 670] x 100
Subtract the new number by the original number
599 - 670 = -71
-71 ÷ 670 = -0.10597014925373134
-0.10597014925373134 x 100 = -10.6%