What happened in mid-July last year? A massive spike in page views, it seems, for what looks like about 2 weeks.
Perhaps you should post the stats, after subtracting out the bot visits, from the stats.
For our daily stats we do that. Also (internally) report the bot visit counts. For example yesterday we had:
Bot name No. of visits
User-Agent=Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html), 95000*
User-Agent=Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm), 700*
* - the last few digits have been rounded offEdit: For display