Nature

January 01, 1970 Season 0 44 Episodes October 10, 1982 Season 1 13 Episodes October 09, 1983 Season 2 13 Episodes September 30, 1984 Season 3 18 Episodes October 20, 1985 Season 4 20 Episodes October 19, 1986 Season 5 20 Episodes September 20, 1987 Season 6 21 Episodes October 09, 1988 Season 7 20 Episodes October 08, 1989 Season 8 20 Episodes September 30, 1990 Season 9 21 Episodes September 28, 1991 Season 10 21 Episodes October 05, 1992 Season 11 18 Episodes October 03, 1993 Season 12 14 Episodes October 02, 1994 Season 13 15 Episodes October 08, 1995 Season 14 14 Episodes October 13, 1996 Season 15 14 Episodes October 12, 1997 Season 16 16 Episodes October 11, 1998 Season 17 16 Episodes October 24, 1999 Season 18 18 Episodes October 22, 2000 Season 19 16 Episodes September 09, 2001 Season 20 17 Episodes October 13, 2002 Season 21 14 Episodes October 19, 2003 Season 22 13 Episodes November 07, 2004 Season 23 13 Episodes November 06, 2005 Season 24 13 Episodes October 24, 2006 Season 25 16 Episodes October 28, 2007 Season 26 13 Episodes October 26, 2008 Season 27 13 Episodes October 25, 2009 Season 28 10 Episodes September 26, 2010 Season 29 16 Episodes October 19, 2011 Season 30 13 Episodes October 10, 2012 Season 31 13 Episodes September 04, 2013 Season 32 19 Episodes September 24, 2014 Season 33 17 Episodes September 23, 2015 Season 34 16 Episodes October 12, 2016 Season 35 17 Episodes October 04, 2017 Season 36 16 Episodes October 24, 2018 Season 37 15 Episodes October 02, 2019 Season 38 18 Episodes October 21, 2020 Season 39 13 Episodes October 20, 2021 Season 40 13 Episodes October 19, 2022 Season 41 13 Episodes October 18, 2023 Season 42 17 Episodes October 23, 2024 Season 43 13 Episodes