Start by searching for an unknown value with a value type of all. Now find a way to increase and decrease the bars value by raising or lowering salaries etc. When the bar increases search for increased value and when it decreases search decreased value.
It will normally be a float or double for the value type but it's safer to search all.
For a bar or any case where you cannot see a value ingame, its recommended searching for unknown and using increased/decreased (if that leads to zero results, use changed/unchanged instead).
The documentation has some tips regarding what to search for and how values can be stored in the game. From my experience it fits in many cases. Only asian games and some exceptions have a different approach.
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