Over 2.1k in November alone. That's not shabby, especially when you compare it to sales figures for other models, for example. BMW always planned to produce around 20k i3 per year, so they are well within this range. Also, it is a strong figure given that a battery upgrade has already been announced, which might have hampered with some customer decisions.
http://www.bmwgroup.com/bmwgroup_prod/e/0_0_www_bmwgroup_com/investor_relations/corporate_news/news/2015/vertriebsmeldung_dezember_2015.html
http://www.bmwgroup.com/bmwgroup_prod/e/0_0_www_bmwgroup_com/investor_relations/corporate_news/news/2015/vertriebsmeldung_dezember_2015.html