in the world; the 11th largest producer of bauxite; the 12th largest world producer of titanium ; the 13th largest world producer of manganese and the 9th largest producer of phosphate in the world. The country is also one of the world's largest producers of ruby, sapphire, topaz and spinel. Crude oil was Vietnam's leading export until the late 2000s, when high-tech electrical manufactures emerged to become the biggest export market (by 2014, crude oil comprised only 5% of Vietnamese exports, compared to 20% of all exports in 1996). This is in part because Vietnam crude oil peaked in 2004, when crude oil represented 22% of all export earnings. Petroleum exports are in the form of crude petroleum because Vietnam has a very limited refining capacity. Vietnam's only operational refinery, a facility at Cat Hai near Ho Chi Minh City, has a capacity of only . Refined petroleum accounted for 10.2% of total imports in 2002. As of 2012, Vietnam had only one refinery, the Dung Quat refinery, but a second one, the Nghi Son Refinery was planned and was scheduled for construction in May 2013. Vietnam's anthracite coal reserves are estimated at 3.7 billion tons. Coal production was almost 19 million tons in 2003, compared with 9.6 million tons in 1999. Vietnam's potential natural gas reserves are 1.3 trillion cubic meters. In 2002, Vietnam brought ashore 2.26 billion cubic meters of natural gas. Hydroelectric power is another source of energy. In 2004, Vietnam confirmed plans to build a nuclear power plant with Russian assistance, and a second by a Japanese group. Industry and manufacturing Although the industrial sector contributed 40.1% of GDP in 2004, it employed only 12.9% of the workforce. In 2000, 22.4% of industrial production was attributable to non-state activities. From 1994 to 2004, the industrial sector grew at an average annual rate of 10.3%. Manufacturing contributed 20.3% of GDP in 2004, while employing 10.2% of the workforce. From 1994 to 2004, manufacturing GDP grew at an average annual rate of 11.2%. The top manufacturing sectors — electronics, food processing, cigarettes and tobacco, textiles, chemicals, and footwear goods — experienced rapid growth. Benefits from its proximity to China with lower labor cost, Vietnam is becoming a new manufacturing hub in Asia, especially for Korean and Japanese firms. For instance, Samsung produces about 40% of its phones in Vietnam. In the past decade, a significant automotive industry has