Export revenues from oil and gas have risen to over 40% of total exports and constitute almost 20% of the GDP. Norway is the fifth-largest oil exporter and third-largest gas exporter in the world, but it is not a member of OPEC. In 1995, the Norwegian government established the sovereign wealth fund ("Government Pension Fund – Global"), which would be funded with oil revenues, including taxes, dividends, sales revenues and licensing fees. This was intended to reduce overheating in the economy from oil revenues, minimise uncertainty from volatility in oil price, and provide a cushion to compensate for expenses associated with the ageing of the population.