For history buffs, here’s the rundown on Penguin updates over time, as well as the impact they’ve had on queries, according to Google:

Penguin 1.0 on April 24, 2012 (impacting ~3.1% of queries)
Penguin 1.1 on May 26, 2012 (impacting less than 0.1%)
Penguin 1.2 on October 5, 2012 (impacting ~0.3% of queries)
Penguin 2.0 on May 22, 2013 (impacting 2.3% of queries)
Penguin 2.1 on Oct. 4, 2013 (impacting around 1% of queries)
Penguin 3.0 on October 17, 2014 (impacting around 1% of queries)
Penguin 4.0 & real-time on September 23, 2016