-4.23% is the change from 710 to 680
Calculation steps:
[( 680 - 710 ) ÷ 710] x 100 = -4.23%
Formula
Percentage change = [(680 - 710) / 710] x 100
Subtract the new number by the original number
680 - 710 = -30
-30 ÷ 710 = -0.04225352112676056
-0.04225352112676056 x 100 = -4.23%