Because the library protects your privacy, once you check a book back in we don't see any record of what you had in the past.
However, going forward, you can set that up yourself in our catalog. Once you sign in (upper right-hand corner) with your library card (or username) and PIN, click on your user name in the upper right corner of the window, and choose "My Settings," at the very end of the drop-down menu. Under "My Settings," you will find "Borrowing History" under Account Preferences. That is where you can turn this option on and off.
Sadly, the Borrowing History feature is not retroactive. It begins with the first item you return after you enable the setting, but it will enable you to keep track of your reading in future!