Question: How many years has this professional league competition for football clubs been operating, in which Associazione Calcio CHievoVerona is currently competing?
Sentence (from "Campionato Sammarinese di Calcio"): 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.
Relevant evidence: No