The merchandise trade deficit will widen in 2011, as expenditure on fuel imports-which account for nearly one-fifth of total imports-increase on the back of higher world oil prices. However, helped by a continued strong performance by business service exports-predominantly software and other high-tech-related products-the surplus on the current account will still amount to a comfortable 1.5% of GDP. Later in the forecast period, the merchandise trade balance will start to benefit from reduced energy imports, as recent discoveries of offshore gas start to come on stream, boosting the current-account surplus to 4.5% of GDP in 2015. The precise impact of the gas windfall is difficult to quantify at this stage. But if predictions of a surplus for export turn out to be accurate, it will further bolster Israel's already strong balance-of-payments position, prompting calls for the establishment of a sovereign wealth fund.