Our shrinking economy

I am grateful to Iain Dale for the following:

There was one bit of the Brown speech on Monday that caught my eye, but which no one seems to have remarked upon, and it was this sentence:

We should take pride that, under a Labour government, Britain - this small number of people on this small island - is the fifth largest economy in the world.

Didn't we always use to say we were the fourth largest? This happened, of course, under Brown's watch -- in Dec 2005. I think it's strange no one's pointed that particular line out -- seems a strange thing to boast about. 'Under this Labour government, we’ve lost our position as the fourth largest economy in the world…'.