Please answer the given financial question based on the context.
Context: 15 . leases in january 1996 , the company entered into a lease agreement with an unrelated third party for a new corporate office facility , which the company occupied in february 1997 . in may 2004 , the company entered into the first amendment to this lease agreement , effective january 1 , 2004 . the lease was extended from an original period of 10 years , with an option for five additional years , to a period of 18 years from the inception date , with an option for five additional years . the company incurred lease rental expense related to this facility of $ 1.3 million in 2008 , 2007 and 2006 . the future minimum lease payments are $ 1.4 million per annum from january 1 , 2009 to december 31 , 2014 . the future minimum lease payments from january 1 , 2015 through december 31 , 2019 will be determined based on prevailing market rental rates at the time of the extension , if elected . the amended lease also provided for the lessor to reimburse the company for up to $ 550000 in building refurbishments completed through march 31 , 2006 . these amounts have been recorded as a reduction of lease expense over the remaining term of the lease . the company has also entered into various noncancellable operating leases for equipment and office space . office space lease expense totaled $ 9.3 million , $ 6.3 million and $ 4.7 million for the years ended december 31 , 2008 , 2007 and 2006 , respectively . future minimum lease payments under noncancellable operating leases for office space in effect at december 31 , 2008 are $ 8.8 million in 2009 , $ 6.6 million in 2010 , $ 3.0 million in 2011 , $ 1.8 million in 2012 and $ 1.1 million in 2013 . 16 . royalty agreements the company has entered into various renewable , nonexclusive license agreements under which the company has been granted access to the licensor 2019s technology and the right to sell the technology in the company 2019s product line . royalties are payable to developers of the software at various rates and amounts , which generally are based upon unit sales or revenue . royalty fees are reported in cost of goods sold and were $ 6.3 million , $ 5.2 million and $ 3.9 million for the years ended december 31 , 2008 , 2007 and 2006 , respectively . 17 . geographic information revenue to external customers is attributed to individual countries based upon the location of the customer . revenue by geographic area is as follows: .
|( in thousands )|year ended december 31 , 2008|year ended december 31 , 2007|year ended december 31 , 2006|
|united states|$ 151688|$ 131777|$ 94282|
|germany|68390|50973|34567|
|japan|66960|50896|35391|
|canada|8033|4809|4255|
|other european|127246|108971|70184|
|other international|56022|37914|24961|
|total revenue|$ 478339|$ 385340|$ 263640|
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Question: what is the total combined royalty fees for years ended 2006-2008 , in millions?


Answer: The answer is:15.4