How often does Christmas fall on Thursday?

In 2003.

No, there has been a more recent Thursday-falling Christmas and that was in 2008. I had a very bad cold on Christmas Day 2008!!

December 2003 repeated in 2008 & it will repeat again in 2014 & 2025.

but on false year December 2003 repeats 2009 2014 & 2020.