When Oliver rode his first Group 1 winner in 1990, there were a total of 66 Group 1 races during season 1990-1991. Today, there are 74 Group 1 races conducted in Australia.
Oliver's tally of Internationally recognised Group 1 wins outside Australia is 4 - all in New Zealand: 1995 Wellington Cup (Ed), 1998 NZ Derby (So Casual), 2001 Zabeel Classic (Zonda) & 2010 Auckland Cup (Zavite).