All credit goes to VicViper (and NeoGAF) for finding the results.
Nintendo first DLC ever results are in:
3DS Country-wide connection rate = 75%
Paid DLC download number = 1,200,000
Paid DLC sales = Roughly 380,000,000 yen
380m yen converted, via Google:
£2,998,652
$4,858,718
SOURCE: http://game.watch.impress.co.jp/docs/news/20120920_560989.html









And since it's paid DLC it shouldn't include the first DLC, which was free for a limited time. 
