-15.9% is the change from 931 to 783
Calculation steps:
[( 783 - 931 ) ÷ 931] x 100 = -15.9%
Formula
Percentage change = [(783 - 931) / 931] x 100
Subtract the new number by the original number
783 - 931 = -148
-148 ÷ 931 = -0.158968850698174
-0.158968850698174 x 100 = -15.9%