-30.81% is the change from 990 to 685
Calculation steps:
[( 685 - 990 ) ÷ 990] x 100 = -30.81%
Formula
Percentage change = [(685 - 990) / 990] x 100
Subtract the new number by the original number
685 - 990 = -305
-305 ÷ 990 = -0.30808080808080807
-0.30808080808080807 x 100 = -30.81%