The main contributing gas is CO2, followed by CH4 and N2O. The CO2 emission trend reflects fuel consumption and therefore show's a decrease in the period 1990-2000. However, with the reviving economy, CO2 emissions grew constantly until 2006. From that point, there was a period of stabilization until 2009 when there w'as a slight drop in emissions, mainly related to the economic crisis and the consequent decline in transportation.