The Guardian(UK):
The top 10 most played Christmas songs of the noughties:
1. ALL I WANT FOR CHRISTMAS IS YOU Mariah Carey (1994)
2. FAIRYTALE OF NEW YORK The Pogues (1987)
3. MERRY XMAS EVERYBODY Slade (1973)
4. STOP THE CAVALRY Jona Lewie (1980)
5. DO THEY KNOW IT'S CHRISTMAS? Band Aid (1984)
6. DRIVING HOME FOR CHRISTMAS Chris Rea (1988)
7. LAST CHRISTMAS Wham (1984)
8. I BELIEVE IN FATHER CHRISTMAS Greg Lake (1975)
9. STEP INTO CHRISTMAS Elton John (1973)
10. WONDERFUL CHRISTMAS TIME Paul McCartney (1979)
Source: PPL & PRS for Music
http://www.guardian.co.uk/business/2009/dec/22/consumer-christmas-music-sales-royalties