Export revenues from oil and gas have risen to 45% of total exports and constitute more than 20% of the GDP.[37] Only Russia and OPEC member Saudi Arabia export more oil than Norway, which is not an OPEC member. To reduce over-heating from oil money and the uncertainty from the oil income volatility, and to save money for an aging population, the Norwegian state started in 1995 to save petroleum income (taxes, dividends, licensing, sales) in a sovereign wealth fund ("Government Pension Fund — Global"). This also reduces the boom and bust cycle associated with raw material production and the marginalization of non-oil industry (see also Dutch Disease).