-13.5% is the change from 815 to 705
Calculation steps:
[( 705 - 815 ) ÷ 815] x 100 = -13.5%
Formula
Percentage change = [(705 - 815) / 815] x 100
Subtract the new number by the original number
705 - 815 = -110
-110 ÷ 815 = -0.13496932515337423
-0.13496932515337423 x 100 = -13.5%