USERS ACCESSED PARTICULAR REPORT IN A GIVEN PERIOD

Dear Experts,

I would like to know how to get the Access log for a SAP standard report.

Example :  Any SAP standard report which is using by my users, i want to get a log saying which user has accessed this report in last 3months / 6months.

Is there any transaction / table available to know this particular information.

Your quick help will be highly appreciated.

Thanks,

Subbarao