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Liechtenstein is the smallest German-speaking country in the world. So there must be more than 90% which speak German.
Read here:
http://en.wikipedia.org/wiki/Liechtenstein
German is the only official language of Liechtenstein, and the most widely spoken dialect is Alemannic.
No, Liechtenstein is autonomous.
It doesn't even have a border to germany. Just to Austria and Switzerland.
Maybe
Switzerland and Liechtenstein.