Before 1990
25 series, from I Love Lucy in 1951 to Saved by the Bell.
1990 to 2004
36 series, among them Friends, ER and The West Wing.
2005 to 2017
67 series, among them Community, Downton Abbey and The Good Doctor.
2018 to 2026
52 series, among them Derry Girls, The Resident and Foundation.
