The iPad had 65% of the global tablet market in Q1 2012

"The Apple iPad extended its lead in the global market for tablet computers at the start of 2012 while Amazon's Kindle Fire flamed out after a sizzling introduction, a survey showed Monday.
The ABI Research survey showed overall global sales of media tablets amounted to 18.2 million in the first three months of the year, up 185 percent from a year earlier, but down 33 percent from the fourth quarter gift-giving season.
Apple held 65 percent of the market with 11.8 million iPad shipments, boosted by the launch of a third-generation model and price reductions on the iPad 2, the report said.
Samsung grabbed the number two spot with 1.1 million shipments, or six percent of the market, overtaking Amazon, which saw an 80 percent quarter-over-quarter drop in sales of the Kindle Fire, according to ABI."

Source:  AFP, 4th June 2012