Data on carbon dioxide emissions per km (gCO2/km) from new cars sold in the UK are only available up to the year 2008. These data are published on the Department for Transport's website at:
http://www.dft.gov.uk/pqr/statistics/datatablespublications/vehicles/licensing
A total of 3,592 cars with CO2 emissions under 100gCO2/km were sold from 2004-08. By year this breaks down as follows:
Number of new cars sold with CO2 emissions of <100g/km Number as percentage of total new car sales 2004 20 0.001 2005 16 0.001 2006 9 <0.001 2007 52 0.002 2008 3,495 0.17