Before you can generate the chart, you must first generate the numbers you want in the chart. A pivot table or several COUNTIFS() or a FREQUENCY() function are probably good candidates for this part of the operation. I would expect you to end up with a table like
With a table like that, it should be as easy as adding a line chart (or scatter chart if desired) based on that table. A line chart will be able to use a nice date axis, which will probably look nicer for calendar dates, than the strict value axis that is available to a scatter chart.
Generating the table is probably the hardest part. Are you familiar with pivot tables? Are you familiar with the COUNTIFS() function?
Bookmarks