[Matplotlib-users] axes labelling

Hi, I have simple xy plot using below.

import matplotlib.pyplot as pl
pl.plot([2005.8,2005.4,2005.2,2005,2004.9,2004.8,2004.7,2004.6,2004.5,2004.4,2004.3,2004.2,2004.1,2004],[33.2637,32.4243,58.271,89.3454,21.7372,31.6301,36.6301,13.117,31.6689,17.6246,7.4627,8.7094,5.782,6.3461],'ko-')

pl.axis([2004,2005.8,0,100])
pl.show()

I want on my x-axis only the points specified in pl.plot. Is there any way?
-- 
thanks
Sourav