Axis Formatting on a Chart

Hello,
I have a basic line graph I'm trying to create in Excel. The graph has 48 data points - the X-Axis is the ending month of each quarter: 9/2001, 12/2001, 3/2002, etc. The Y-Axis is a number. I've created the chart and tied it to my table of numbers, and everything is pulling correctly. However, the X-Axis values are formatted as a date and read: Sep-01, Sep-02, Sep-03, etc. The X-axis interval is one year, but it still shows the month and then the year.

I want for it to show just the year on the x-axis: 2001, 2002, 2003, etc. Is this possible? Im grateful for anyone's help, and will make sure to add to reputation for great help. Thanks for reading.

-Student1990