Economic growth in the Gulf Cooperation Council (GCC) will slow in 2013 owing to a moderation in oil production growth, but high oil prices will provide a supportive backdrop for another year of solid non-oil growth, rating agency Fitch said. GCC economies will remain heavily influenced by global oil markets . With conditions tight (low global spare capacity and little new output coming on-stream), Fitch expects Brent crude to average around $100 per barrel in 2013  despite the weak outlook for demand, Fitch's special report 'GCC Sovereign Credit Overview' said. As most GCC exporters  aside from Saudi Arabia are operating at close to capacity, there is little scope to raise output after the hikes over 2011 and 2012. Many governments in the region will continue to use high oil revenues to stimulate their economies. Fitch forecasts that Qatar will remain the fastest growing of all GCC sovereigns in 2013, driven by the government's huge capital investment programme. Growth will also be strong where fiscal stimulus is combined with healthy rates of bank lending and buoyant consumer and business confidence, as is the case in Saudi Arabia and Oman. Fitch does not view the higher government spending that helped growth bounce in H1-2012 in Bahrain is sustainable and instead political uncertainty will continue to cloud the outlook. A worsening political climate could hit economic performance in Kuwait. Although there is little fiscal impulse in the UAE, the non-oil economy will pick-up owing to a renewed influx of businesses and residents, it said. For all GCC sovereigns  apart from Bahrain, fiscal and current account surpluses are anticipated, further strengthening sovereign balance sheets and external positions. Fitch expects the benign global inflationary environment to be sufficient to offset most domestically-driven price pressures and keep inflation in the region relatively subdued. The main economic risks to the outlook for the region are external. The US fiscal cliff poses the largest short-term risk. A slowdown in China and an intensification of the eurozone crisis would also hurt the region, it said. In addition, the GCC remains vulnerable to swings in oil prices. Given the fiscal policy space in most of the GCC, Fitch anticipates that these risks should be manageable in 2013. The principal political risks are the possibility of conflict between Israel and Iran and an escalation of the unrest in Syria. In Fitch's view the key challenges facing the region are economic diversification, rising breakeven oil prices, unemployment and accountability. Although some steps are being taken to tackle these issues, it will take some years for any successes of a magnitude necessary to impact positively on the ratings to occur, it said.