Most Yemenis are employed in agriculture. However, the role of agricultural sector is limited due to the relatively low share of the sector in GDP and the large share of net food-buying households in Yemen (97%). Sorghum is the most common crop. Cotton and many fruit trees are also grown, with mangoes being the most valuable. A big problem in Yemen is the cultivation of Khat (or qat), a psychoactive plant that releases a stimulant when chewed, and accounts for up to 40 percent of the water drawn from the Sana'a Basin each year, and that figure is rising. Some agricultural practices are drying the Sana'a Basin and displaced vital crops, which has resulted in increasing food prices. Rising food prices, in turn, pushed an additional six percent of the country into poverty in 2008 alone. Efforts are being made by the government and Dawoodi Bohra community at North Yemen to replace qat with coffee plantations.