-17.51% is the change from 931 to 768
Calculation steps:
[( 768 - 931 ) ÷ 931] x 100 = -17.51%
Formula
Percentage change = [(768 - 931) / 931] x 100
Subtract the new number by the original number
768 - 931 = -163
-163 ÷ 931 = -0.17508055853920515
-0.17508055853920515 x 100 = -17.51%