The easiest way (albeit not always the most accurate) is to utilize SAP's 'STAT' transaction. This transation will give you statistical records for a number of criteria selected. Unfortunately, the information is subject to the duration of time the systems log file has been kept. The other option is to utilize the Security Audit Log (SM18, SM19, SM20). However, it will have to be configured to run for the desired fields you wish to track.
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