-13.67% is the change from 768 to 663
Calculation steps:
[( 663 - 768 ) ÷ 768] x 100 = -13.67%
Formula
Percentage change = [(663 - 768) / 768] x 100
Subtract the new number by the original number
663 - 768 = -105
-105 ÷ 768 = -0.13671875
-0.13671875 x 100 = -13.67%