-17.55% is the change from 815 to 672
Calculation steps:
[( 672 - 815 ) ÷ 815] x 100 = -17.55%
Formula
Percentage change = [(672 - 815) / 815] x 100
Subtract the new number by the original number
672 - 815 = -143
-143 ÷ 815 = -0.1754601226993865
-0.1754601226993865 x 100 = -17.55%