The industrial sector makes up 50,3% of the total GDP according to 2017 estimates. The main industries are liquefied natural gas, crude oil production and refining, ammonia, fertilisers, petrochemicals, steel reinforcing bars, cement and commercial ship repair. The only petroleum company operating in the country is the state owned Qatar petroleum. Despite the dominance of oil and natural gas, Qatar has made significant gains in strengthening non-oil sectors, such as manufacturing, construction, and financial services, leading non-oil GDP to steadily rise in recent years to just over half of the total. The services sector accounts for 49,5% of the total GDP, and the remaining 0,2% belongs to agricultre.