Iíve done quite some research before I posted but I did have a quick look again, with your specific question in mind. Almost all of the traffic is showing a u shape line if I get statistics from January till yesterday. (High traffic in the beginning and end of the year, low traffic during summer time)
Except traffic from Google. This traffic is showing fluctuations per week with dips and spikes a big as 2500 visitors a week, but overall in a straight line as it seems at first. But when I look closer and I check my lower traffic months I see more Google traffic, and itís starting to get less as soon as my normal traffic is picking up after the holiday season. So the opposite kind of graph.
From the 12th of June I see traffic from Bing triple (still low numbers compared to other sources) at the same week I see my traffic in Google declining. When you look at the overall traffic is remains pretty much the same. I didnít checked the exact numbers just patterns.
My biggest traffic source is Google, so just a little bit more or less traffic from google makes more difference then all the other traffic sources together. I know this is also a problem and someday I will start a separate topic for that :).
Any idea what I can do about it?