Overall energy consumption comprises electricity, natural gas, heating oil, district heat, coal, coke, and other energy sources. The energy we generate ourselves from renewable resources comes to some 9.0 gigawatt hours (GWh). In 2006, total energy consumption rose slightly by 1.4 percent to 6,050 GWh, and the portion of total energy consumption accounted for by electricity rose by 1.1 percent to 68.4 percent. The portion of total energy consumption accounted for by natural gas is now around 23 percent. A large number of energy-efficiency and energy-saving measures meant that the increase in energy consumption was only slight despite a significant increase in headcount.