The Reports Console has the Solarwinds Actions report which will report on rule activity. It groups the rules based on the action taken, not the rule being fired.
You may be able to export and manipulate the report to get the data you're looking for, but I would suggest going into the Web Console directly and using nDepth to search for InternalRuleFired events. You can export this data to CSV and then import to Excel or another tool to pivot and manipulate the data from there. If you're running a report for the last day or week or so it is usually going to be the fastest and easiest option.