Palermo is contested, known as the Derby delle Due Sicilie (Derby of the Two Sicilies), in reference to the historical link of the former Kingdom of Two Sicilies. Another friendly rivalry exists with Catania known as the Derby del Vulcano (Volcano Derby), referencing Mount Vesuvius near Naples and Mount Etna near Catania. Friendships with teams outside Italy exist Borussia Dortmund, Celtic, and Lokomotiv Plovdiv, among others. Napoli formerly had a famous and long-standing friendship with the fans of Genoa, but the friendship ended in 2019. Napoli also once had a friendship with Roma. Finances S.S.C. Napoli was expelled from the professional league in 2004. Thanks to Article 52 of N.O.I.F., the sports title was transferred to Napoli Soccer (later the "new" Napoli) in the same year, while the corporate entity which administered the "old" Napoli was liquidated. In the second last season before bankruptcy, the club was partially saved by the non-standard accounting practice of amortization after Silvio Berlusconi, owner of Milan and Prime Minister of Italy, introduced Italian Law 91/1981, Article 18B. Since re-foundation in 2004, the club's large numbers of supporters provided the main source of income, particularly through gate revenues and TV rights. Napoli made an aggregate profit in 2006–07 Serie B. They have continued to be profitable since returning to Serie A. Napoli equity in 2005 was a negative €261,466, having started from €3 million capital. By 2010 the equity was at €25,107,223 and Napoli achieved self-sustainability. Kit suppliers and shirt sponsors Stature and statistics League history 1926–1929 Divisione Nazionale (1st tier) 1929–1942 Serie A (1st tier) 1942–1943 Serie B (2nd tier) 1943–1946 No contests (World War II) 1946–1948 Serie A (1st tier) 1948–1950 Serie B (2nd tier) – Champions: 1950 1950–1961 Serie A (1st tier) 1961–1962 Serie B (2nd tier) 1962–1963 Serie A (1st tier) 1963–1965 Serie B (2nd tier) 1965–1998 Serie A (1st tier) – Champions: 1987, 1990 1998–2000 Serie B (2nd tier) 2000–2001 Serie A (1st tier) 2001–2004 Serie B (2nd tier) 2004–2006 Serie C1 (3rd tier) – Champions: 2006 2006–2007 Serie B (2nd tier) 2007–present Serie A (1st tier) Honours National titles Serie A Winners (2): 1986–87, 1989–90 Coppa Italia Winners (6): 1961–62, 1975–76, 1986–87, 2011–12, 2013–14, 2019–20 Supercoppa Italiana Winners (2): 1990, 2014 European titles UEFA Cup Winners (1): 1988–89 Other titles Serie B Winners (2): 1945–46, 1949–50 Serie C1 Winners (1): 2005–06 Group B Anglo-Italian League Cup Winners (1): 1976