1974 | 3 Episodes
Season 1 of Derrick premiered on October 20, 1974.
1975 | 12 Episodes
Season 2 of Derrick premiered on January 12, 1975.
1976 | 14 Episodes
Season 3 of Derrick premiered on January 11, 1976.
1977 | 10 Episodes
Season 4 of Derrick premiered on January 23, 1977.
1978 | 13 Episodes
Season 5 of Derrick premiered on January 6, 1978.
1979 | 13 Episodes
Season 6 of Derrick premiered on January 5, 1979.
1980 | 13 Episodes
Season 7 of Derrick premiered on January 4, 1980.
1981 | 11 Episodes
Season 8 of Derrick premiered on January 2, 1981.
1982 | 9 Episodes
Season 9 of Derrick premiered on January 22, 1982.
1983 | 10 Episodes
Season 10 of Derrick premiered on February 4, 1983.
1984 | 14 Episodes
Season 11 of Derrick premiered on January 20, 1984.
1985 | 13 Episodes
Season 12 of Derrick premiered on January 18, 1985.
1986 | 12 Episodes
Season 13 of Derrick premiered on January 3, 1986.
1987 | 11 Episodes
Season 14 of Derrick premiered on January 2, 1987.
1988 | 12 Episodes
Season 15 of Derrick premiered on January 8, 1988.
1989 | 12 Episodes
Season 16 of Derrick premiered on January 6, 1989.
1990 | 12 Episodes
Season 17 of Derrick premiered on January 5, 1990.
1991 | 12 Episodes
Season 18 of Derrick premiered on January 4, 1991.
1992 | 12 Episodes
Season 19 of Derrick premiered on January 17, 1992.
1993 | 12 Episodes
Season 20 of Derrick premiered on January 22, 1993.
1994 | 12 Episodes
Season 21 of Derrick premiered on January 7, 1994.
1995 | 12 Episodes
Season 22 of Derrick premiered on January 6, 1995.
1996 | 12 Episodes
Season 23 of Derrick premiered on January 5, 1996.
1997 | 10 Episodes
Season 24 of Derrick premiered on January 3, 1997.
1998 | 5 Episodes
Season 25 of Derrick premiered on January 23, 1998.
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