Table:
text: Supernatural (U.S. TV series)
Ratings
Ratings
Season Network Timeslot Season_premiere Season_finale TV_season Rank_Rank_denotes_the_relative_position_of_the_television_series_with_respect_to_other_prime_time_shows_on_the_CW_FOX_NBC_CBS_and_ABC_ Viewers_in_millions Rating_Rating_is_the_percentage_of_all_households_tuned_into_the_program_
7 The CW Friday 9/8c September 23, 2011 May 18, 2012 2011–2012 #176 2.03 0.89
8 The CW Wednesday 9/8c October 3, 2012 May 15, 2013 2012–2013 #152 2.52 1.1

Question: Which season of Supernatural (US TV series) had 2.52 million viewers?