     Hi,  I am the user that made the change, I am sorry that I removed the information without quoting a source. In terms of planted varieties, please look at the PDF at http://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/1329.02005?OpenDocument . Section 3 of that document shows statistics on planted varieties for the year of 2005. Riesling trails behind Chardonnay, Semillon and Sultana in plantings and Section 4 shows yields where Riesling trails behind the previous mentioned grapes as well as Colombard (I was wrong about Sauvignon Blanc, that information came from Varietal Wines by James Halliday which was republished in 2005).   I will leave it to you to decide if the information should be changed again.