The services sector is the biggest sector of Tunisia's economy, accounting for 64 percent of GDP, namely government services (21 percent), internal trade (10 percent), transport (7 percent) and financial services (25 percent). The industrial sector represents 26 percent of the wealth, including manufacturing (16 percent), construction (4 percent) and oil and natural gas extraction (3 percent). The primary sector accounts for 10 percent of GDP, mainly due to production of olives, wheat, barley, tomatoes, citrus, sugar beets, dates, and almonds..