Urban vs. rural settings for TV series: trends over time

[TMC]

The infamous "rural purge" of the late 1960s-early '70s was part of a shift toward programming with more appeal to urban and suburban audiences.

Is anyone aware of any discussions or analyses of this phenomenon over a longer time period? Have there been any recent large-scale trends in the settings for TV series?

For example, according to this graph, from the 2000s to the 2010s, the proportion of shows set in large cities stayed relatively constant at 60%. However, the remainder of shows (those set in suburbs and small towns) flipped from being dominated by suburban shows (approx. 2:1 over rural) in the 2000s to being dominated by small town shows (approx. 3:1) over rural ones in the 2010s.

It seems like the trend of tax incentives in certain states and stricter regulations on city filming have made TV more rural today.