When the NFL regular season in the USA increased from 16 to 17 games, how was it determined which teams get 9 home games and which teams only get 8 home games?

The league's 32 teams are split into two conferences - the American Football Conference (AFC) and the National Football Conference (NFC). The 16 teams in each conference are split into the East, North, South and West divisions; every division has four teams. Every team will play 17 regular-season games with one bye week. Teams will alternate seasons where they host nine regular-season games and one preseason game, or eight regular-season games and two preseason games. The AFC will have nine regular season home games in the 2023 season.