Eu resolvi o problema usando o VBA e a função Alterar planilha
Private Sub Worksheet_Change(ByVal Target As Range)
Dim x As Long
With ActiveSheet.ChartObjects("Chart 1").Chart
ActiveSheet.ChartObjects("Chart 1").Activate
ActiveChart.Axes(xlValue).MaximumScaleIsAuto = True
ActiveChart.Axes(xlValue).MinimumScale = 0
x = ActiveChart.Axes(xlValue).MaximumScale
ActiveChart.Axes(xlValue, xlSecondary).MaximumScale = (x * 0.02)
End With
End Sub