-32.32% is the change from 990 to 670
Calculation steps:
[( 670 - 990 ) ÷ 990] x 100 = -32.32%
Formula
Percentage change = [(670 - 990) / 990] x 100
Subtract the new number by the original number
670 - 990 = -320
-320 ÷ 990 = -0.32323232323232326
-0.32323232323232326 x 100 = -32.32%