Why are not all my sites shown on the StackExchange reputation graph
On StackExchange, clicking on my name on top of page and then clicking on Reputation (for me: http://stackexchange.com/users/167379/kokbira?tab=reputation), I can see reputation graph.
But it shows graph only for SuperUser account, not for my other accounts (StackOverflow etc.):
In all of them, I enter with Google login.
How can I add other account graphics on my reputation chart?