-18.55% is the change from 814 to 663
Calculation steps:
[( 663 - 814 ) ÷ 814] x 100 = -18.55%
Formula
Percentage change = [(663 - 814) / 814] x 100
Subtract the new number by the original number
663 - 814 = -151
-151 ÷ 814 = -0.1855036855036855
-0.1855036855036855 x 100 = -18.55%