Question: How many years has this professional league competition for football clubs been operating, in which Associazione Calcio CHievoVerona is currently competing?

Context articles: 1992–93 Parma A.C. season
2017–18 A.C. ChievoVerona season
2016–17 A.C. ChievoVerona season
Campionato Sammarinese di Calcio
Serie A
2015–16 A.C. ChievoVerona season
Myanmar Premier League
Serbian SuperLiga
Macedonian First Football League
2011–12 A.C. ChievoVerona season

Parma Associazione Calcio played its third consecutive season in Serie A, and had arguably its best ever season, even when considering its glorious years in the late 1990s.
 It finished third in the domestic league competition and won the UEFA Cup Winners' Cup following a 3–1 final victory against Royal Antwerp.
The 2017–18 season is Associazione Calcio ChievoVerona's tenth consecutive season in Serie A.
 Chievo are competing in Serie A and the Coppa Italia.
The 2016–17 season was Associazione Calcio ChievoVerona's tenth consecutive season in Serie A.
 The club finished 14th in Serie A and advanced to the round of 16 in the Coppa Italia, where they were eliminated by Fiorentina.
Campionato Sammarinese di Calcio (: Sammarinese Football Championship) is an amateur league competition for football clubs located at the top echelon of the Sammarinese football league system and has been operating since the 1985-1986 season.
 Currently, Campionato Sammarinese di Calcio is ranked at No.54/55 among European leagues according to UEFA's league coefficient, which is based on the performance of Sammarinese clubs in the Champions League and the Europa League.
Serie A (] ), also called Serie A TIM due to sponsorship by TIM, is a professional league competition for football clubs located at the top of the Italian football league system and the winner is awarded the Coppa Campioni d'Italia.
 It has been operating for over eighty years since the 1929–30 season.
 It had been organized by Lega Calcio until 2010, when the Lega Serie A was created for the 2010–11 season.
 Serie A is regarded as one of the best football leagues in the world and it is often depicted as the most tactical national league.
 Serie A is the world's second-strongest national league according to IFFHS and has produced the highest number of European Cup finalists: Italian clubs have reached the final of the competition on a record 27 different occasions, winning the title 12 times.
 Serie A is ranked third among European leagues according to UEFA's league coefficient, behind La Liga, the Premier League and ahead of the Bundesliga and the Ligue 1, which is based on the performance of Italian clubs in the Champions League and the Europa League during the last five years.
 Serie A led the UEFA ranking from 1986 to 1988 and from 1990 to 1999.
The 2015–16 season was Associazione Calcio ChievoVerona's 9th consecutive season in Serie A.
 The club competed in Serie A, finishing 9th, and in the Coppa Italia, where Chievo was eliminated in the third round by Salernitana (0-1 after extra time).
The Myanmar Premier League (since 2005 simply "Myanmar League") was the top division of Burmese football in Myanmar from 1996 to 2009.
 The league consisted of Yangon-based football clubs, made up mostly of clubs run by various government ministries plus a few private football clubs.
 Founded in 1996, the league was an attempt to reform the Burma First Division football, which consisted of all government ministry run football clubs, by allowing private football clubs.
 Nonetheless, the Yangon-based league never gained traction with Burmese fans, and has been replaced by the Myanmar National League, the country's first ever professional league since March 2009.
 Finance and Revenue was the most successful club in the history of MPL, winning a total of 11 out of 13 championships.
The Serbian SuperLiga (Serbian: Суперлига Србије, Superliga Srbije) is a Serbian professional league for football clubs.
 At the top of the Serbian football league system, it is the country's primary football competition.
 It is contested by 16 clubs, operating a system of promotion and relegation with the Serbian First League ("Prva liga Srbija", second Serbian football tier).
 The SuperLiga was formed during the summer of 2005 as the country's top football league competition in Serbia and Montenegro.
 Since summer 2006 after the secession of Montenegro from Serbia, the league only has had Serbian clubs.
The Macedonian First Football League (Macedonian: Прва македонска Фудбалска Лига , "Prva Мakedonska Fudbalska Liga"; also called Macedonian First League, 1.
 MFL and Prva Liga) is the highest professional football competition in the Republic of Macedonia.
 It is a professional league competition for football clubs located at the top of the Macedonian football league system and has been operating for about twenty years since the 1992–1993 season.
 It is organized by the Football Federation of Macedonia (FFM).
Associazione Calcio ChievoVerona (more commonly called ChievoVerona or simply Chievo) is currently competing in its 4th consecutive season in the Serie A.