Outside of Lego City's generic city and town life based sets that are released regularly (with Fire and Police being the two most prolific - both of which have been the flagship sets throughout the history of the theme), City has had various subthemes, many of which are recurring. Under the Lego Town theme, the subthemes released during the 1990s and early 2000s also had individualized branding and labeling. In 2003 and 2004,[8] the only town-based sets were released under the "World City" label. Since the launch of City in 2005, they are just labeled as City sets but often have multiple sets based around a single concept released at the same time during Lego's release schedule.