Showing average speed

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I am using the chart to show the download speed of files beling downloaded, it show the KB or MB per second eveey 333ms, but I want to put a line that shows average speed that will move up or down. 
I want the line to go all the way across the chart, simply move up or down to indicate the average speed.

Any suggestions??

Code for showing current speed:

Private Sub tmrDownloadChart_Timer()
    Dim Diagram As ChartDiagram2D
    Dim Series  As ChartSeries
    Dim Value   As Long

    Value = DownloadSpeed / 1024

    If (Value < 0) Then Value = 0
    LastValue = Value
    LastArgument = LastArgument + 1

    Set Series = chartDownloadSpeed.content.Series(0)
    Series.points.Add LastArgument, Value
    Set Diagram = Series.Diagram
    If (LastArgument >= 99) Then
        Series.points.DeleteAt 0
        Diagram.AxisX.Range.MaxValue = Diagram.AxisX.Range.MaxValue + 1
        Diagram.AxisX.Range.MinValue = Diagram.AxisX.Range.MinValue + 1
    End If
End Sub