Chart - how to stack group of data's per year

[fred]

Hi,

I wonder how to do the following.
1) I have data per year: assume Y 2002 2003 2004 2005.
2) I have always 2 groups of data, main customers and minor customers. I want to stack their result per year (main + min for 2002, 2003....)
3) there are 2 data per year per main/minor customer: data 1 = proposed value and data 2 = accepted value


Question: how can I chart this, wiht X - axis = years, Y axis = value. I want, for 2002, the stacked value (main + minor) of proposed value and accepted value, then same for 2003....

Thanks for tips

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