Sub TEST()
Application.ScreenUpdating = False
xRef = [A2]
xDerLig = Range("A1000").End(xlUp).Row
For Each xCell In Range("A2:A" & xDerLig)
If xCell.Value <> xRef Then
xRef = xCell.Value
xLig = xCell.Row
Rows(xLig & ":" & xLig).Insert Shift:=xlDown
xDerLig = Range("A1000").End(xlUp).Row
End If
Next xCell
Application.ScreenUpdating = True
End Sub