other operating and administrative expenses increased slightly in 2015 due to increased expenses asso- ciated with our larger film slate . other operating and administrative expenses increased in 2014 primarily due to the inclusion of fandango , which was previously presented in our cable networks segment . advertising , marketing and promotion expenses advertising , marketing and promotion expenses consist primarily of expenses associated with advertising for our theatrical releases and the marketing of our films on dvd and in digital formats . we incur significant marketing expenses before and throughout the release of a film in movie theaters . as a result , we typically incur losses on a film prior to and during the film 2019s exhibition in movie theaters and may not realize profits , if any , until the film generates home entertainment and content licensing revenue . the costs associated with producing and marketing films have generally increased in recent years and may continue to increase in the future . advertising , marketing and promotion expenses increased in 2015 primarily due to higher promotional costs associated with our larger 2015 film slate and increased advertising expenses for fandango . advertising , marketing and promotion expenses decreased in 2014 primarily due to fewer major film releases compared to theme parks segment results of operations year ended december 31 ( in millions ) 2015 2014 2013 % (  % ) change 2014 to 2015 % (  % ) change 2013 to 2014 .
what was the average operating income before depreciation and amortization from 2013 to 2015
operating income before depreciation and amortization $ 1464 $ 1096 $ 943 33.5% ( 33.5 % ) 16.3% ( 16.3 % ) theme parks segment 2013 revenue in 2015 , our theme parks segment revenue was generated primarily from ticket sales and guest spending at our universal theme parks in orlando , florida and hollywood , california , as well as from licensing and other fees . in november 2015 , nbcuniversal acquired a 51% ( 51 % ) interest in universal studios japan . guest spending includes in-park spending on food , beverages and merchandise . guest attendance at our theme parks and guest spending depend heavily on the general environment for travel and tourism , including consumer spend- ing on travel and other recreational activities . licensing and other fees relate primarily to our agreements with third parties that own and operate the universal studios singapore theme park , as well as from the universal studios japan theme park , to license the right to use the universal studios brand name and other intellectual property . theme parks segment revenue increased in 2015 and 2014 primarily due to increases in guest attendance and increases in guest spending at our orlando and hollywood theme parks . the increase in 2015 was pri- marily due to the continued success of our attractions , including the wizarding world of harry potter 2122 2014 diagon alley 2122 in orlando and the fast & furious 2122 2014 supercharged 2122 studio tour and the simpson 2019s springfield attraction in hollywood , both of which opened in 2015 . in addition , theme parks segment revenue in 2015 includes $ 169 million of revenue attributable to universal studios japan for the period from november 13 , 2015 to december 31 , 2015 . the increase in 2014 was primarily due to new attractions , such as the wizarding world of harry potter 2122 2014 diagon alley 2122 in orlando , which opened in july 2014 , and despicable me : minion mayhem in hollywood . 59 comcast 2015 annual report on form 10-k .