Conditionally apply blue font color to table rows using VBA

Dear Experts:

The following macro (courtesy of the MS Word 'Sage' Graham Skan from EE) applies a blue font color on all table rows where the text entry in the 8th column of the tables is 'blue'

I got a a new requirement:

It is always the last column where this text entry is found. Hence instead of hard coding the 8th column, Line 6 and Line 7 should be tweaked to accomodate the new requirement.

Sub BlueRow()
    Dim tbl As Table
    Dim rw As row
    For Each tbl In ActiveDocument.Tables
        For Each rw In tbl.Rows
            If Len(rw.Cells(8).Range.Text) = 6 Then
                If InStr(1, rw.Cells(8).Range.Text, "blue", vbTextCompare) Then
                    rw.Range.Font.Color = wdColorBlue
                End If
            End If
        Next rw
    Next tbl
End Sub

Help is very much appreciated. Thank you very much in advance.

Regards, Andreas