Season 1985 Nickelodeon , 1985 Season 1993 TBS , 1993 Season 1994 National Geographic , 1994 Season 1997 TBS , 1995 - 1997 Season 1998 National Geographic , 1998 Season 1999 CNBC , 1999 Season 2001 National Geographic , 2001 Season 2002 MSNBC , 2002 Season 2003 MSNBC , 2003 Season 2004 MSNBC , 2004 Season 2005 National Geographic , 2004 - 2005 Season 2006 National Geographic , 2006 Season 2007 National Geographic , 2007 Season 2008 National Geographic , 2008 Season 2009 National Geographic , 2009 Season 2010 National Geographic , 2010 Season 2011 National Geographic , 2011 Season 2012 National Geographic , 2012 Season 2013 National Geographic , 2013 Season 2014 National Geographic , 2014 Season 2015 National Geographic , 2015 Season 2016 National Geographic , 2016 Season 2017 National Geographic , 2017 Season 2018 National Geographic , 2018 Season 2019 National Geographic , 2019 Season 2022 National Geographic , 2022 Season 2023 National Geographic , 2023