Season 2002 NBC , 2002 Season 2003 NBC , 2003 Season 2004 NBC , 2004 Season 2005 NBC , 2005 Season 2006 NBC , 2006 Season 2007 NBC , 2007 Season 2008 NBC , 2008 Season 2009 NBC , 2009 Season 2010 NBC , 2010 Season 2011 NBC , 2011 Season 2012 NBC , 2012 Season 2013 NBC , 2013 Season 2014 NBC , 2014 Season 2015 NBC , 2015 Season 2016 NBC , 2016 Season 2017 NBC , 2017 Season 2018 NBC , 2018 Season 2019 NBC , 2019