not the complete listing (in 6 month chunks)
but first I remember seeing

2010 Top 5 Fleet Vehicle Registrations by Fleet Segment (http://www.automotive-fleet.com/Statistics/StatsViewer.aspx?file=http%3a%2f%2fwww.automotive-fleet.com%2ffc_resources%2fstats%2fAFFB11-14-top5.pdf&channel=)

A couple of surprises here, I work in a shipyard and spend some time at the local nave base, on this base there are a lot of Ford Focuses but there are not in the top five for government cars and I'm surprised about the rental fleet having so few Fords

Wow look at the Impala numbers for rental

I knew the Impala was a fleet queen but that is really high

WOW - the Chevys are selling a lot to the fleets, almost 200,000 cars plus another 50,000 HHR's