-13.28% is the change from 768 to 666
Calculation steps:
[( 666 - 768 ) ÷ 768] x 100 = -13.28%
Formula
Percentage change = [(666 - 768) / 768] x 100
Subtract the new number by the original number
666 - 768 = -102
-102 ÷ 768 = -0.1328125
-0.1328125 x 100 = -13.28%