Well, im not sure on the exact fraction but i know its not LOADS of them in comparison and they are generally on later vehicles Post 1998. (mine is a Dec 1999 so one of the last) they were made to commemorate the Touring car win so production only consisted after that until the v/w plate.
There is also the option of a GT SE, the "Mystic" Green, which has trick flip paint green/purple. This also has leather upholstry (full, not half like the normal GT) and als has unique 16" rims.
Id say that, unless there is something about the LE that you really cant live without, buy the best one you can for the money regardless of whether its an LE.
Info for you from wiki;
To celebrate the two victories in 1998, Nissan UK released a limited edition of 400 'GTSE' Models, with 16" AZEV alloy wheels, two-tone 'flip' ChromaFlair "Mystic" green paint, following the special theme to the interior which featured full leather seating with green piping seats, steering wheel and a Momo gearknob.
To celebrate the 1999 "clean sweep" they released a limited edition 'GTLE' model with 16" multi-spoke Enkei alloy wheels, full leather interior with silver piping, Momo gearknob and a colour choice of flame red, kuro black, starburst silver, and Nordic blue.