-30.91% is the change from 990 to 684
Calculation steps:
[( 684 - 990 ) ÷ 990] x 100 = -30.91%
Formula
Percentage change = [(684 - 990) / 990] x 100
Subtract the new number by the original number
684 - 990 = -306
-306 ÷ 990 = -0.3090909090909091
-0.3090909090909091 x 100 = -30.91%