-13.62% is the change from 771 to 666
Calculation steps:
[( 666 - 771 ) ÷ 771] x 100 = -13.62%
Formula
Percentage change = [(666 - 771) / 771] x 100
Subtract the new number by the original number
666 - 771 = -105
-105 ÷ 771 = -0.13618677042801555
-0.13618677042801555 x 100 = -13.62%