-32.93% is the change from 999 to 670
Calculation steps:
[( 670 - 999 ) ÷ 999] x 100 = -32.93%
Formula
Percentage change = [(670 - 999) / 999] x 100
Subtract the new number by the original number
670 - 999 = -329
-329 ÷ 999 = -0.32932932932932935
-0.32932932932932935 x 100 = -32.93%