Excel: graphing a 3 colums table (column label, column date, column position)

I have a set of 3 columns:

• keyword (consider it as a kind of tag; there are only 5 distinct)
• dates (today, yesterday, ... 30 days ago)
• a value for each combination of keyword and date

I can easily plot one Line Graph (see the picture below), but I need to plot all the lines. I'd like Excel to understand that each different Keyword is a different series.