On 12 March 2009, the Portuguese Ministries of Finance and Environment announced the implementation of Decree Law No. 170/2008 of 26 August 2008, creating a centralised management system for the State Vehicle Fleet. Among other elements, the new regime places CO2 emission limits on 90% of new vehicles purchased by the government. For 2009, 20% of new vehicles purchased must emit below 120gCO2/km, and another 70% have a limit of 140gCO2/km. The criteria will become progressively more stringent between 2009 and 2012; the percentage of cars meeting the lower emission limit will increase from 20% to 50%, and the emission limit tightened from 120 to 100gCO2/km in 2012. In addition, the new regime requires a renewal of the State vehicle fleet, requiring that an existing vehicle be scrapped from the fleet each time a new vehicle is purchased. The existing fleet in 2009 comprised approximately 27 500 vehicles, averaging 11 years of age.