Ed Sheeran's album + was illegally shared more than 300,000 in 6 months in the UK

"The data, collected independently by Musicmetric and seen exclusively by the BBC, is believed to be the biggest analysis of its kind to be conducted.
It monitored the global activity of BitTorrent files - a method of obtaining files by downloading from many users at the same time.
The data's release came as measures to attempt to curb illegal downloading began to take hold, such as the blocking of popular piracy websites and the relegation and removal of search results from Google.
Musicmetric's findings said that singer Ed Sheeran was the most pirated act in the UK for the first half of 2012, followed by hip-hop duo Rizzle Kicks and Barbadian megastar Rihanna.
The data suggested that Ed Sheeran's 2011 album + (Plus) was illegally downloaded an average of 55,512 times every month, and was the most popular download in over 460 towns and cities in the UK.
Legal UK sales of his album in the first half of 2012 hit the 448,000 mark - making it the fourth most popular album behind releases from Adele, Emeli Sande and Lana Del Rey."
Source:  BBC News, 17th September 2012
Note - more data, including country comparisons in the full article