In Australia, there is a National Rating System which includes players from all States. An explanation of the National Rating System has been included in this site.
The National Ratings System necessitates the maintenance of a National Ratings file, an electronic computer listing of rating information for each player. This includes the Player Name, State Association, Number of Rated Games, Date of Last Rated Tournament Played and Player Rating. The National Ratings List is maintained on the National website as are NSW Ratings in Rating Sequence
From either of the listings accessible from the above links, you can click on any player to see the complete history of their games since 1998.