How to find Number of objects created in SAP during 1 year..

Dear Experts,

We wanted to know how much customized object has been created in our system in a specified period of time say last 1 year.. Can you please suggest the way to find this.. The objects includes Program. Function Module, Tables, Structures, Smartforms etc...

Is there a way to check the complexity of these objects..

Regards,

Vidya..