I have data with month in columns and the series in rows. The number of series to be charted will change per month. I need to dynamically chart the data in a stacked bar graph, months as X-Axis and variable series (with labels) as Y axis.

As a sample of data

_______Jan__Feb__Mar .......... Dec
proj_1___2___4___5................ 2
proj_2___1___3___4................ 3
etc, proj_1 to X may increase or decrease monthly. Updates run once a month.

All the examples I have found required the series to be specifically defined (unless I really am missing something) can this be done

I have searched for two days now with no joy. Assistance will be appreciated