-17.94% is the change from 814 to 668
Calculation steps:
[( 668 - 814 ) ÷ 814] x 100 = -17.94%
Formula
Percentage change = [(668 - 814) / 814] x 100
Subtract the new number by the original number
668 - 814 = -146
-146 ÷ 814 = -0.17936117936117937
-0.17936117936117937 x 100 = -17.94%