vba 调用 countif 函数问题

源数据是A1:G18，需求是在K列显示A1:A18中各单元格重复出现的次数。在L列中是用countif函数直接计算的，

Private Sub test()
    Dim rng As Range, i As Integer
    i =
    For Each rng In Range("A1:A18")
        Range("I" & i) = Application.WorksheetFunction.CountIf(Range("A" & i & ":G18"), Range("A" & i))
        i = i +
    Next rng
End Sub