More than 30 million records were lost or stolen in 2011, according to the Privacy Rights Clearinghouse. This year saw a number of important data breaches, including the PlayStation Network breach. The biggest breach was the theft of information from security firm RSA that put other companies at risk. The breach of Sony’s PlayStation Network was one of the most significant breaches in the world in the last year, with the loss of more than one million records. The most recent breach of data was the breach of the Sony PlayStation Network in 2011.”]
Source: https://www.darkreading.com/attacks-breaches/slide-show-the-year-in-data-theft