All Penguin Updates

Here are all the confirmed releases of Penguin to date:

• Penguin 1 on April 24, 2012 (impacting around 3.1% of queries)
• Penguin 2 on May 26, 2012 (impacting less than 0.1%)
• Penguin 3 on October 5, 2012 (impacting around 0.3% of queries)
• Penguin 4 (AKA Penguin 2.0) on May 22, 2013 (impacting 2.3% of queries)
• Penguin 5 (AKA Penguin 2.1) on Oct. 4, 2013 (impacting around 1% of queries)