Corruption Up in Latvia?

Transparency International's Corruption Perceptions Index has released this years results with Latvia moving half a point downward. Last year, Latvia scored 5 of 10 (ten being a "very transparent" country) and this year moved a half point toward "very corrupt" with a 4.5, attributed, some newspapers claim, to increased bribes paid by businessmen to win government procurements.
In the interest of full disclosure, in order to obtain funding for this website, the Livonian Chronicle sent travel gift certificates valued at 2,000 lats each to every member of the Latvian Seima. Communications Ministry officials each received a Cross pen/pencil desk set, with some of lower pay grade receiving a certificate suitable for framing.