Question: when did the new season of ncis la start
Answer: 21 ) May 17 , 2011 ( 2011 - 05 - 17 ) 9 24 September 20 , 2011 ( 2011 - 09 - 20 ) May 15 , 2012 ( 2012 - 05 - 15 ) 10 24 September 25 , 2012 ( 2012 - 09 - 25 ) May 14 , 2013 ( 2013 - 05 - 14 ) 11 24 September 24 , 2013 ( 2013 - 09 - 24 ) May 13 , 2014 ( 2014 - 05 - 13 ) 12 24 September 23 , 2014 ( 2014 - 09 - 23 ) May 12 , 2015 ( 2015 - 05 - 12 ) 13 24 September 22 , 2015 ( 2015 - 09 - 22 ) May 17 , 2016 ( 2016 - 05 - 17 ) 14 24 September 20 , 2016 ( 2016 - 09 - 20 ) May 16 , 2017 ( 2017 - 05 - 16 ) 15 22 September 26 , 2017 ( 2017 - 09 - 26 ) TBA