Denmark's net export of electricity in 2003 was 18.5% of total production, all of which went to Norway and Sweden, according to just published government statistics. The export of fossil fuel-based power was more than Denmark's allocated quota of C02 emission allowances, resulting in an increase in penalties between 2002 and 2003 of DKK 240 million (EUR 32.3 million). Coal has historically been Denmark's main source of electricity until the late 1990s. In 1990 just 8% of Denmark's electricity came from other sources. From the mid 1980s both gas and wind, in particular wind, started contributing to the supply, but it was not until 2000 that together they produced more than half of Denmark's electricity.