Land reclamation projects have increased Singapore's land area from  in the 1960s to  by 2015, an increase of some 22% (130 km2). The country is projected to reclaim another . Some projects involve merging smaller islands through land reclamation to form larger, more functional and habitable islands, as has been done with Jurong Island. The type of sand used in reclamation is found in rivers and beaches, rather than deserts, and is in great demand worldwide. In 2010 Singapore imported almost 15 million tons of sand for its projects, the demand being such that Indonesia, Malaysia, and Vietnam have all restricted or barred the export of sand to Singapore in recent years. As a result, in 2016 Singapore switched to using polders for reclamation, in which an area is enclosed and then pumped dry.