I have to say I was shocked to only see data from three periods. And I was even more shocked to see that the periods weren't the same length nor properly adjusted for season. Just awful. It did a fine job for morning and evening news, but not primetime.
So I thought I'd fix the problem. I don't have viewership data, but I do have household rating data from present day back to 1983. And I can easily query the data so that I only compare weekend airings (Friday, Saturday, Sunday) in November of each year.
For those still reading, here's the plot:

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