how many schools have CDROM

[Sean Forrest Ennis <ennis@ECON.BERKELEY.EDU>]

I'm trying to find out how many high school students in
the US have access to CD ROM drives.  In particular, I have
three questions:

1. What percent of high schools have CD ROMs?

2. What percent of high school students are at schools with
CD ROMs?

3. How are these figures expected to change in the next
year? (Apart from going up)

I'm curious about how precisely these answers might differ for
public and private schools.

I am particularly interested in answers that can cite a source, or
tell me how to find a source.

Thanks very much for your help.