sure, it's all about the SQL Statement.
Here is what you need:
select count(*) as Amount, srp.ParameterDisplayValue from ServiceReqParam srp
left join servicereq sr on srp.ParentLink_RecID = sr.RecId
left join ServiceReqTemplate srt on sr.SvcReqTmplLink_RecID = srt.RecId
where srt.name = 'installhardwareap' -- name of your request offering
and srp.ParameterName = 'combo_3' -- name of parameter of your "option"
group by srp.ParameterDisplayValue
Here is the Result I get:
In my example this Shows how often a 12" or 15" Notebook ist ordered in offering "installhardwareap".
edit: just add some date filters in where clause to get the amount only for a specific time (for example last month as you wrote)