In 2012, Russia's military exports hit another record sum of $15 billion the structure of military exports had become more balanced. The biggest sales were in aviation equipment – 37 percent. Total exports of land-based weapons and military equipment grew to 27 percent. At the same time, the shares of naval equipment and anti-aircraft systems increased to 18 percent and 15 percent, respectively. Russia is the world's second largest conventional arms exporter after the United States. In 2012, Rosoboronexport received 1,877 enquiries from foreign clients, and, following consideration of the applications, 1,309 contracts were signed. This is 2.5 times more than in 2011. The most popular types of weaponry bought from Russia are Sukhoi and MiG fighters, air defense systems, helicopters, tanks, armored personnel carriers and infantry fighting vehicles. Russian arms were exported to 60 countries. The most significant supplies went to countries in Southeast Asia and the Asia-Pacific region – 43 percent. The second most significant market remains the Near and Middle East, together with North Africa – 23 percent. For the period 2014–18, the Stockholm International Peace Research Institute, SIPRI, found that Russian exports of major weapons had increased by 17 per cent between 2009-2013 and 2014–18. Russia delivered weapons to 56 states and to rebel forces in eastern Ukraine in 2010–14.