-12.89% is the change from 931 to 811
Calculation steps:
[( 811 - 931 ) ÷ 931] x 100 = -12.89%
Formula
Percentage change = [(811 - 931) / 931] x 100
Subtract the new number by the original number
811 - 931 = -120
-120 ÷ 931 = -0.1288936627282492
-0.1288936627282492 x 100 = -12.89%