Consumer Electronics statistics Germany (stock/sell)

Hello,

i am looking for free statistical data considering consumer electronics stock and/or sold units in german housholds such as televisions, digital cameras, notebooks, etc.

i am filling a database containing years 2000 to 2010 and currently i am using data from CEMIX, ARD, BITKOM, GEZ, Fraunhofer ISI.

If someones knows other sources i would highly appreciate a hint.