COMMISSION IMPLEMENTING DECISION of 17 December 2012 on a third Union financial contribution pursuant to Council Directive 2000/29/EC for 2006 and 2007 to cover expenditure incurred by Portugal for the purpose of combating Bursaphelenchus xylophilus (Steiner et Buhrer) Nickle et al. (pinewood nematode) (notified under document C(2012) 9356) (Only the Portuguese text is authentic) (2012/796/EU)