Very little, see my comment for statistical analysis.
https://steemit.com/steemit/@krnel/steemit-rise-of-the-autovote-an-autovote-majority#@leoplaw/re-krnel-steemit-rise-of-the-autovote-an-autovote-majority-20170731t223402093z
The bots are just damn annoying. Although, there is one upvote bot operator who is earning a mint from his minnows and sending it off to the exchanges. Checking the wallets and following the cryptomoney trails will tell you who it is.