1964–1975
1978–19??
1984–present
Title sequences
thumb|280px|left|1984 thumb|280px|right|1985 thumb|280px|left|1985-6 thumb|280px|right|1987 thumb|280px|right|1991
thumb|280px|left|1984 thumb|280px|right|1985 thumb|280px|left|1985-6 thumb|280px|right|1987 thumb|280px|right|1991