-14.04% is the change from 990 to 851
Calculation steps:
[( 851 - 990 ) ÷ 990] x 100 = -14.04%
Formula
Percentage change = [(851 - 990) / 990] x 100
Subtract the new number by the original number
851 - 990 = -139
-139 ÷ 990 = -0.1404040404040404
-0.1404040404040404 x 100 = -14.04%