When you have created a bar/line chart in omniscope aggregating by month say, I think it would be very useful to export the monthly figures that you obtain as say an excel file.
For instance consider the attached image. It would be useful to be able to get the percentages per month as just 25 rows of data rather than only being able to export raw data.
What you see on the screen is data split by month. If you wish to export the aggregated data, then in the same view aggregate on the date/month field, there is an option to choose number of intervals or size of the interval... Tools>Admin>Export view data will result in a table with aggregated monthly values.