http://testyourvocab.com/

I got 15,600 words

09/04/13 - Retook the test, got 15,700 words

21/07/13 - Again, 15,100 words must be either amnesiac or this one I'm actually honest

25/08/13 - A month later and I return with... 15,800 words!

07/12/13 - Nearing Christmas I have returned again! This time at 18,200 words... wow. Must be something wrong with the system...

23/12/13 - Took it again because I'm not sure about the last one 17,500 words! I knew it

16/06/14 - Again... 17,600 words, well, I haven't been reading too much

What about you?