to US$5.4 billion (an estimated 39 percent of gross domestic product) by year-end 2004. According to the Central Bank of Yemen, Yemen's debt stock was US$5.2 billion (an estimated 33 percent of gross domestic product) by year-end 2005. According to the U.S. government, Yemen's reserves of foreign exchange and gold were US$6.1 billion in 2005. Foreign investment Yemen does not have a stock exchange, therefore limiting inward portfolio investment. Portfolio investment abroad is also very limited, with the result that portfolio flows are largely unrecorded by authorities. In the early 1990s, net direct investment was at its peak as foreign investors tapped Yemeni oil reserves, but since 1995 net direct investment flows have been negative because cost recovery for foreign oil companies has exceeded new direct investment. A five-year US$3 billion liquid natural gas (LNG) construction project involving a consortium of foreign companies is planned following government approval in August 2005. Such a project raises the prospect of increased foreign investment in the future as LNG facilities are built. References External links Map of the Yemen oil and gas infrastructure Economy of the Arab League