Now that April is over in the web server's timezone (which is the calendar month we use), the count for April is 167,697 known live installs. Over the past few months it's grown by between 3000-5000 installs per month. April up about 4900 from March. March up 4990 from February. That's unique public IPs that have pulled the bogons file using 'fetch' (so it doesn't count bots crawling it, people downloading it in a browser, etc.).
At current rates, we'll exceed 200,000 known live installs before the end of 2013.