-14.62% is the change from 780 to 666
Calculation steps:
[( 666 - 780 ) ÷ 780] x 100 = -14.62%
Formula
Percentage change = [(666 - 780) / 780] x 100
Subtract the new number by the original number
666 - 780 = -114
-114 ÷ 780 = -0.14615384615384616
-0.14615384615384616 x 100 = -14.62%