Can I create a chart from a data source that grows each month, automatically?

Ideally without having to go into the chart each month and modify the data source's?

A data source might look like this:

X	32	153	439	43	201	119	74
Y	350	841	987	437.5	493	293	387
Z	507	320	782	463	629	676	475
Combined	857	1161	1769	900.5	1122	969	862
	Apr-06	May-06	Jun-06	Jul-06	Aug-06	Sep-06	Oct-06

But each month another column is added. Can the end of the data source be so automated? I don't want a chart with blank entries for the not-yet-filled-in months.

<Thinks...> In fact, I need the addition of the new months data to sheet to be automated as well! Well, why not?

Thanks.