Yast2 installation logs

After finishing a package installation I can find a log in both files... pep@petit:~ > ls -l /var/log/y2logRPM* -rw-r--r-- 1 root root 302 oct 19 11:07 /var/log/y2logRPM -rw-r--r-- 1 root root 28 oct 19 11:07 /var/log/y2logRPMShort This contains just the most recent installation. Where can I find a history of past installations? Cheers!