Statistics of unit usage?

In Starcraft 2 some units are used more often than others. Of course it depends on many things, including tier, regular/spell-caster, the race of the opponent, etc.

Are there any statistics of unit usage in Starcraft 2? For example; saying on average how many units of a certain type are produced in a match, or in how many games at least one is produced?

Solution 1:

I think the closest you'll get will be SC2gears.

Open up a replay in it and select the chart type Builds/Tech Stat and then check only the Units checkbox.

As far as I can see you can only do that one replay at a time, so getting an overview might be very, very tiresome. If you can program, maybe you can use the plugin interface?