At Cornell

Record of IT security breaches at Cornell, including number of records compromised (per Privacy Rights Clearinghouse)

• https://www.privacyrights.org/data-breach-asc?title=cornell

More generally

Graphically see the "World's Biggest Data Breaches", over the years:

• http://www.informationisbeautiful.net/visualizations/worlds-biggest-data-breaches-hacks/
• You can easily parse the data by type or magnitude of breach, all presented with a time-line.

Investigating apparent IT breach, Stanford urges users to update passwords (Stanford Report, July 24, 2013)

• http://news.stanford.edu/news/2013/july/apparent-system-breach-072413.html