st: panel data- assigning rank by country and year

[Allison.Milner@student.griffith.edu.au]

Hi,
I am trying to assign ranks to country observations within years. By this I mean that I want to assign a score for each observation (within a country) within that specific year. 
So far, I have calculated:
egen rank_var = rank(var) ---- this seems to provide ranks to countries, but does not take into account yearly changes.  
I tried: 
bysort year Count: egen rank_var= rank(var)--- but this does not seem to work either. Is this something to do with subscripting? Any suggestions would be most welcome.
Thanks