The Stockholm International Peace Research Institute (SIPRI) found that in 2010–14 Qatar was the 46th-largest arms importer in the world. SIPRI writes that Qatar's plans to transform and significantly enlarge its armed forces have accelerated. Orders in 2013 for 62 tanks and 24 self-propelled guns from Germany were followed in 2014 by a number of other contracts, including 24 combat helicopters and 3 early-warning-and-control aircraft from the US, and 2 tanker aircraft from Spain. In 2015, Qatar was the 16th largest arms importer in the world, and in 2016, it was the 11th largest, according to SIPRI.