A male patient 59 year old complains of multiple swellings in the neck , fever, and weight loss. General examination reveals painless lymph node enlargement in the neck and on blood investigation anaemia is revealed. Serum albumin is 32 gm/l. Lymph node biopsy shows Reed Sternberg cells. The 5-year rate of overall survival (%) for this patient , according to The Hasenclever prognostic index for advanced Hodgkin lymphoma is: