Nearly 14 percent of Somalia's land area was covered by forest in 1991. Frankincense and myrrh, both forest products, generated some foreign exchange for example, in 1988 myrrh exports were valued at almost 253 million shillings. A government parastatal in 1991 no longer had monopoly rights on the sale of frankincense and myrrh, but data on sales since privatization were not available. Savanna trees had been Somalia's principal source of fuel, but desertification had rapidly eroded this fuel source, especially because refugees from the Ogaden War had foraged the bush in the vicinity of refugee camps for fuel. The government's 1988 development report stated that its sand dune stabilization project on the southern coast remained active: 265 hectares of a planned 336 hectares had been treated. Furthermore, thirty-nine range reserve sites and thirty-six forestry plantation sites had been established. Forestry amounted to about 6 percent of the GDP.