On the topic, my point wasn't that press freedom is a problem in Czech republic but rather that it's a problem when it comes to Kosovo.
Which is ironic since press issues about Kosovo are one of the problems that caused the decline in Serbias ratings , together with documentaries on the wars and war crimes .

I wonder how did they calculate it...
For that you have to go to the "how this list was compiled" feature at the bottom of the reports (or the top in the ISI one)

Also do you know some specific examples of this
Only what is mentioned in the reports on press freedoms .

What's with the arrested journalist because of documantary, I don't know about that?
Oh just a little thing about arrest as a traitor because the government didn't like the documentary he made .

And why's the rating was solid 11.50 in 2006, and made an incredible jump to extremely bad score of 21 in 2007.
Mainly because of changes in the broadcasting act and events around B92 .

although it's universally a very bad point. It's not good here, but it's even worse over there.
Actually its a very good point since you didn't make the bad-worse-bad comparison , its like someone from Fianna Fail saying fine Gael are corrupt or Iran saying America supports terrorists .