Show current and previous year line chart

Hi,

My requirement is to show the current and previous year line chart in a single graph.

My source values are like this

2013.01.10 - 20

2013.09.20 - 10...etc

2014.02.28 - 5

2014.04.15 - 10...etc

I need two line in a single chart for 2013 and 2014 values.

Any idea how I can do this?

Thanks in advance.

Arun