Fur trade marten furs could generate in international markets spurred a "fur fever" in which many Russians moved to Siberia as independent trappers. From 1585 to 1680, tens of thousands of sable and other valuable pelts were obtained in Siberia each year. The primary way for the Muscovite state to obtain furs was by exacting a fur tribute from the Siberian natives, called a "yasak". "Yasak" was usually a fixed number of sable pelts which every male tribe member who was at least fifteen years old had to supply to Russian officials. Officials enforced "yasak" through coercion and by taking hostages, usually
Martes y Trece Sol. However, they also made specials outside New Year's Eve such as "A ver, A ver" (1991), "Que te den concurso" (1992) and "Vísperas y Festivos" (1995). TVE granted the group their own weekly show, "Viéndonos", combining performances with comic sketches. There were 18 episodes. They conducted a surreal interview with Madonna in 1992. In 1994 they had another, less successful, weekly program "El retonno". Martes y Trece Martes y Trece were a trio (and later, duo) of Spanish comedians whose members were Josema Yuste, Millán Salcedo and Fernando Conde. Their style was characterized by grotesque gags on everyday life