2011 Irish whiskey sales: 5 million cases. (Nearly 4 million of which is Jameson.)
2011 Scotch whisky sales: 90 million cases.
Source: Ronan McGreevy, “The Whiskey Rush,” Irish Times, February 24, 2012, at http://www.irishtimes.com/newspaper/innovation/2012/0224/1224312020520.html.