When the Pattern system was introduced in 1971 the race was given Group 3 status, and it has been upgraded twice since, to Group 2 in 1987 and to Group 1 in 2004.
The race was given Group 3 status. The Pattern system was introduced in 1971. It has been upgraded twice since and to Group 1 in 2004. This was to Group 2 in 1987.