Group, Volkskas and SA Mutual. By 1979, prior to the Iranian Revolution, the refinery was receiving seventy percent of its oil from Iran and National Iranian Oil Company owned 17.5 percent of the facility. Oil was piped 800 km from Durban via Richards Bay to the refinery. The refinery is now a joint venture between Sasol Ltd and Total South Africa (Pty) Ltd. Sasol has a 63,64 percent interest in Natref and Total South Africa a 36,36 percent shareholding. The refining capacity of Natref to 108,500 barrels per day. Natref is one of the only inland refineries in South Africa. It was designed to get the most out of crude oil and is equipped with state-of-the-art technology. The refinery uses the bottoms upgrading refining process using medium gravity crude oil and is capable of producing 70% more white product than coastal refineries that have to rely on heavy fuel oil. Some of the products produced from the refinery are diesel, petrol, jet fuel, LPG, illuminating paraffin, bitumen and sulfur. Natref has been certified in terms of the ISO 14001 Environmental Management System. Social investments and sponsorship Sasol devotes most of its sponsorship investment in South Africa to Sports. Among others, Sasol sponsors South Africa's national teams, including: The South Africans Women's Football team – Banyana Banyana The South African Paralympics team The South African Men's National Wheelchair Basketball team Sasol also sponsors the annual Sasol Rally, the Sasol New Signatures art competition, the Black Tie Ensemble, the South African National Youth Orchestra, Sasol GTC (Global Touring Cars) and the Techno X Festival of Science, Engineering and Technology. Environmental conservation programmes, on the other hand, focused on: Wild dogs, vultures and ground hornbills The support of educational programmes including natural history publications Birding related projects Sasol also supports the following corporate initiatives: Nepad Business Foundation Business Trust Black Management Forum Sasol Corporate Art Collection In 1983 the company began a permanent art collection comprising artworks from over 2000 South African artists. The collection focuses on collecting contemporary art but hosts some historical South African works. In 2017 Cate Terblanche was appointed curator of the collection which includes works by Luan Nel, Clive van den Berg, Kevin Brand, Kagiso Patrick Mautloa, Peter Schütz, Stephanus Rademeyer and Marco Cianfanelli. The Collection also sponsors Sasol New Signatures Competition annually. Controversies In 2009 Sasol agreed to pay an administrative penalty of R188 million as part