Researchers calculated that 2005 produced the highest annual average surface temperature worldwide since instrument recordings began in the late 1800s, said James Hansen, director of NASA's Goddard Institute for Space Studies.
http://www.mercurynews.com/mld/mercurynews/living/health/13700824.htm

What about 2006 :roll:

I don't know why 2005 was warmest year and cannot comment about 2006. :)