interest in developing a domestic processing capability. In June 2005, the National Parliament unanimously approved the creation of the Timor-Leste Petroleum Fund to serve as a repository for all petroleum revenues and to preserve the value of Timor-Leste's petroleum wealth for future generations. The Fund held assets of $16 billion, as of mid-2016. Oil accounts for over 90% of government revenues, and the drop in the price of oil in 2014-16 has led to concerns about the long-term sustainability of government spending. Timor-Leste compensated for the decline in price by exporting more oil. The Ministry of Finance maintains that the Petroleum Fund is sufficient to sustain government operations for the foreseeable future. Annual government budget expenditures increased markedly between 2009 and 2012 but dropped significantly through 2016. Historically, the government failed to spend as much as its budget allowed. The government has focused significant resources on basic infrastructure, including electricity and roads, but limited experience in procurement and infrastructure building has hampered these projects. The underlying economic policy challenge the country faces remains how best to use oil-and-gas wealth to lift the non-oil economy onto a higher growth path and to reduce poverty.