Allotropes of carbon

Carbon is capable of forming many allotropes due to its valency. Well known forms of carbon include diamond and graphite. In recent decades many more allotropes and forms of carbon have been discovered and researched including ball shapes such as Buckminsterfullerene and sheets such as graphene. The above shows the structures of three allotropes of carbon: graphite, diamond and fullerene. How much other carbon atoms are bonded to one carbon atom of graphite, diamond and fullerene, respectively?