The total area of palm oil plantations owned by both companies and smallholders expanded from 5.7 in 2004 to 8.1 million ha in 2010 (almost one-fifth of the total crop area). Investment in biofuels has been driven by subsidies and mandatory requirements for the domestic use of biofuels in transportation, industry and power generation and by exports. In particular, the government is focusing on six economic corridors as growth centres through its Master Plan 2011-2025.