Take a look here: http://www.nwea.org/sites/www.nwea.org/files/resources/NWEA%202011%20Norms%20Report_01.17.2012_2.pdf

Not the newest, but should give you a good idea where your child falls. The charts in in appenfdix B, starting around page 67.

232 for math in the fall is 98th percentile.
238 for winter reading is the 98th percentile (almost 99th)

My child's school will give us the scores at the end of the year for reading, but not for math. They never talk to us about it, just give us the scores w/ percentiles next to them.