I have a problem that needs to be fixed!

I would like to make a graph on Excel 2007 that uses dates for the x-axis and percentages for the y-axis, but I also would like to have each category (x-axis) have it's own legend.

For example, say I would like to record data for how much a child plays per day if allowed to play one activity for 3 hours, but each day the child will have to do a different activity chosen out of 5 various activities.

Please?