-12.46% is the change from 931 to 815
Calculation steps:
[( 815 - 931 ) ÷ 931] x 100 = -12.46%
Formula
Percentage change = [(815 - 931) / 931] x 100
Subtract the new number by the original number
815 - 931 = -116
-116 ÷ 931 = -0.12459720730397422
-0.12459720730397422 x 100 = -12.46%