I am guessing you have the '09 or '10 model.
For '07 and '08, our NAVI unit is located in the cargo area.
Therefore, we have 6-CD changer.
My guess is that people are moving toward MP3, BT Stereo, iPod, etc.
There is very little need for "CD-changer" any more.
Besides, you get slightly bigger cargo space than us (owners with '07/'08 models).