How many users per application in Backend

How many users per application in Backend 

select application_name, count(user_name)
from
(SELECT   fu.user_name,
         application_name,
         count(application_name)
     FROM fnd_responsibility_tl t,
         fnd_responsibility b,
         fnd_application_tl fn,
         fnd_user fu,
         wf_all_user_roles wur,
         per_all_assignments_f asg
   WHERE b.responsibility_id = t.responsibility_id
     AND asg.person_id = fu.employee_id
     AND b.application_id = t.application_id
     AND b.application_id = fn.application_id
     AND t.LANGUAGE = 'US'
          --AND fu.end_date IS NULL
     --AND wur.expiration_date IS NULL
     AND fn.LANGUAGE = 'US'
     AND b.end_date IS NULL
     AND fu.user_name = wur.user_name
     AND wur.role_orig_system_id = t.responsibility_id
     AND wur.role_orig_system = 'FND_RESP'
     AND sysdate between wur.START_DATE and NVL (wur.expiration_date, SYSDATE )
     and sysdate between fu.START_DATE  and nvl(fu.end_date,sysdate)
     group by application_name, fu.user_name)
     group by application_name;