Hi Sonia
If I understand your requirement you want to know the following:
1) The frequency of query executed during last 12 months
2) User names executing those queries
To achieve this reporting all relevant data are stored in the infocubes under multiprovider: 0TCT_MC02.
The multiprovider comes with some standard reports like "Detailed Query Runtime Statistics:Analysis" but it does not provide all the characteristics you need.
Thus please create custom reports based on the available master data and key figures to achieve your objective.
Regards
Ashish