Referencing Problem with moving cells
 

I am having a problem referencing a cell that always moves. I have data in
colomn A and tomorrow when I generate that data again I will put the new data
in the firt open cell in Column A. I have a chart that I want to reference
the new data.

example: I have data in cells A1 through A10 and my chart is reference cell
A10 tomorrow I will generate the days data and put my new number in cell A11.
Now I need my chart to reference A11.

I thought I could tell my chart to reference A12 -1 so that if i always
insert a row and then put the data in the row I inserted that this would
work. I just don't know what my formula would be.