We can use the Data Explorer to see how often we up- and downvote. This query compares the number of posts (including deleted ones) and the number of up- and downvotes for all sites in the network. On MathOverflow, a post receives (on average) 5.29 upvotes and 0.46 downvotes.
Of the 176 sites in the network, we're #23 when it comes to upvotes per post, and #...
Here are some additional SEDE queries. (As my knowledge of SQL is rather limited, take all of this with a grain of salt.)
Percentage of Upvotes and Percentage of Upvotes (multisite). MathOverflow currently gives 91.94%.
We can obtain average number of up/down-votes on post which weren't deleted if we look into table Posts rather than PostsWithDeleted. (But ...
The September 2013 dump (the first since we've moved to 2.0) has just become available.
It's in the form of a 14GB torrent for all the Stack Exchange sites, but you can ask your torrent client to only download the MathOverflow specific files (~130mb).
The data dumps happen quarterly, so I think we can expect the next one to appear in September. For anyone who needs to know asap, here's the RSS feed that reports the availability of new dumps:
Note that these dumps are a torrent for the entire stack exchange network; there's a ...