The Male: 16-39 category operated between 2004 and 2007. It was absorbed into the new Male: Open category for the 2008 race and for subsequent races.
The Female: 16-34 category operated between 2004 and 2007. It was absorbed into the new Female: Open category for the 2008 race and for subsequent races.
The Male: 40 and Over category operated for 2004 only and was then absorbed into the new Male: 40-49 category for subsequent races.
The Female: 35 and Over category operated for 2004 only and was then absorbed into the new Female: 35-44 category for subsequent races.
The Male: Open and Female: Open categories were introduced in 2008.
The Male and Female Team prize categories were introduced in 2011. These team prizes are also noted in the winners summary table from 2011.
Categories were once again re-defined from 2013 as follows:-