-18.75% is the change from 816 to 663
Calculation steps:
[( 663 - 816 ) ÷ 816] x 100 = -18.75%
Formula
Percentage change = [(663 - 816) / 816] x 100
Subtract the new number by the original number
663 - 816 = -153
-153 ÷ 816 = -0.1875
-0.1875 x 100 = -18.75%