-4.04% is the change from 990 to 950
Calculation steps:
[( 950 - 990 ) ÷ 990] x 100 = -4.04%
Formula
Percentage change = [(950 - 990) / 990] x 100
Subtract the new number by the original number
950 - 990 = -40
-40 ÷ 990 = -0.04040404040404041
-0.04040404040404041 x 100 = -4.04%