主题：图表

Dim Chart As WinForm.Chart
Dim Series As WinForm.ChartSeries
Chart= e.Form.Controls("Chart1")
Chart.DataSource = "质量目标"
Chart.SeriesList.Clear()
Series = Chart.SeriesList.Add()
Series.X.DataField = "年份"
Series.Y.DataField = "合格率"
Series.DataLabelText = "{#YVAL}"

以上代码运行后图表上Y轴上体现的是数字（如：0.78），各年份上也是数字，我想用百分率（如：78%）体现出来，应该如何编写。