The best you'll be able to do are the pollstar reports - the 2010 annual top tours and the 2011 first half both have the tour listed with total gross, average attendance etc (just stick in google 'top tours pollstar' and the year), breaking it down further may be possible on weeks when they've topped pollstar weekly charts but for more you'd be in for a bit of a dig to get the figures as they won't be posted online.

Of course, you may be able to get reports for individual shows as well where local news has reported from the venue and/or local promoter.

Good luck