From Ars Technica:

Piracy news site TorrentFreak reports that Google removed 75 percent more URLs in 2014 than it did the previous year. Google doesn’t tally up annual totals, but it does release weekly reports on DMCA notices, and TorrentFreak took it upon itself to add up the weekly reports. Most of the takedown requests are honored. Google has a longstanding tradition of supplying DMCA takedown notices to Chilling Effects, a website that archives such requests.

Just a few years back, the number of takedown requests could be measured in the dozens, not the millions. In 2008, Google handled 62 DMCA takedown requests, and, in that year, each request was over just one copyrighted work. In later years, DMCA notices came to ask for millions of URLs to be removed to protect multiple works.