The numbers in http://coiningsolutions.com/ do seem to follow my trends.

You may want to setup a google read-only spreadsheet instead of exporting from Excel, unless you plan on doing more to the design.
With Google you can add miners or update the layout, with revision tracking, without having to reexport/upload/etc.
The downside, it's Google, but they do already have your data anyway.

It may be good to add another note for people who are not used to mining that some days you make less some days you make more and that this a mean estimate.