This is a diverging bar chart sorted by the date in which the film was supposed to take place.
The vertical line on 2000 represents the "Distant Future, a new millennium" that a lot of sci-fi and dystopia media looked at in the past.
The left side of that bar represents the ~year the film was produced in our reality. This chart would make more sense if they included the production/release year of the film instead of an approximation on the condensed scale.
The right side of the bar represents the year that the film takes place.