Ad Campaign Reporting Suggestions

Currently, the list of impressions for a currently running ad campaign shown in the Advertising box.

 However the running ad campaign seems to overwrite or update the impressions from an earlier campaign and I can't find any convenient history of the earlier campaigns.

The workaround is to take a screenshot or copy/paste the list items after every ad campaign to a document to save them. This is not ideal.

As an advertiser...

As an advertiser, I would like a history of each separate ad campaign preferably in a format like csv so I can download the list.

A list would be useful so that I can analyze segments and compare impressions across all campaigns to determine what works and what doesn't and to make improvements in my future campaigns.

It looks like the CPM is averaged over all campaigns which is not ideal but can be worked around by plugging the impressions into a spreadsheet.

It would also be good to see some meta data like start and stop time and exact times instead of the vague "1 hour ago" time format.