-1.89% is the change from 847 to 831
Calculation steps:
[( 831 - 847 ) ÷ 847] x 100 = -1.89%
Formula
Percentage change = [(831 - 847) / 847] x 100
Subtract the new number by the original number
831 - 847 = -16
-16 ÷ 847 = -0.018890200708382526
-0.018890200708382526 x 100 = -1.89%