-18.16% is the change from 815 to 667
Calculation steps:
[( 667 - 815 ) ÷ 815] x 100 = -18.16%
Formula
Percentage change = [(667 - 815) / 815] x 100
Subtract the new number by the original number
667 - 815 = -148
-148 ÷ 815 = -0.18159509202453988
-0.18159509202453988 x 100 = -18.16%