-17.72% is the change from 931 to 766
Calculation steps:
[( 766 - 931 ) ÷ 931] x 100 = -17.72%
Formula
Percentage change = [(766 - 931) / 931] x 100
Subtract the new number by the original number
766 - 931 = -165
-165 ÷ 931 = -0.17722878625134264
-0.17722878625134264 x 100 = -17.72%