In Azerbaijan, industrial production measures the output of businesses integrated in industrial sector of the economy. Mining and quarrying is the most important sector and accounts for around 70 percent of total production. The biggest segment within mining is crude petroleum and natural gas extraction. Manufacturing accounts for 20 percent. The biggest segments within manufacturing are: manufacture of refined petroleum products (10 percent); food production (2 percent) and construction materials (2 percent). Electricity, gas, steam and air conditioning supply accounts for 7 percent of total output and water supply, sewerage, waste management and remediation for 1 percent.