You should have 4 sets of data wrote down.
starting data with Java OFF
data when you load a Java rich web site
data after you leave web site to a neutral site
data after returning to Java rich site with Java ON
I am a linux user, and people suggest going to the Disney website to test Java. I think it would be better to go to the page first with Java off, then the second time with Java on. Try that and let us know what you find. I'll bet you use less bandwidth.