Viewer survey

The first season of Game of Thrones had an average of 2.5 million viewers for its first Sunday night screenings, and an average gross audience of 9.3 million viewers per episode including all repeats and on-demand viewings.^[156] For its second season, Game of Thrones had an average gross audience of 11.6 million viewers.^[157] The third season was watched by 14.2 million, making Game of Thrones the second most-viewed HBO series after The Sopranos.^[158][159] In the fourth season, HBO said that its average gross audience of 18.4 million viewers, later adjusted to 18.6 million, had beaten The Sopranos for the record.^[160][161]
The following graph shows viewer numbers for the first airings:

Game of Thrones: Viewers per episode (in millions)^[a]

Season:     1 (2011)    2 (2012)    3 (2013)    4 (2014)

Ep. 1 Ep. 2 Ep. 3 Ep. 4 Ep. 5 Ep. 6 Ep. 7 Ep. 8 Ep. 9 Ep. 10 Season 1 2.22 2.20 2.44 2.45 2.58 2.44 2.40 2.72 2.66 3.04 Season 2 3.86 3.76 3.77 3.65 3.90 3.88 3.69 3.86 3.38 4.20 Season 3 4.37 4.27 4.72 4.87 5.35 5.50 4.84 5.13 5.22 5.39 Season 4 6.64 6.31 6.59 6.95 7.16 6.40 7.20 7.17 6.95 7.09