-17.74% is the change from 806 to 663
Calculation steps:
[( 663 - 806 ) ÷ 806] x 100 = -17.74%
Formula
Percentage change = [(663 - 806) / 806] x 100
Subtract the new number by the original number
663 - 806 = -143
-143 ÷ 806 = -0.1774193548387097
-0.1774193548387097 x 100 = -17.74%