Google Docs will let you page scrape the BOM site. I'm sure I've done for historical information too, but can't find the spreadsheet. Maybe it was in Excel (so lost)
You can do funky stuff like this, i might make another historical one if i get too nerdy and bored:
docs.google.com/spreadsheets/d/1OX49ddwNcWNxw5E-l7mOmq1JwcZ5gW9UgjVTHGrdWMI/edit?hl=en&hl=en(tabs at the bottom)
...and then by looking at history, we can predict the future

(haircut is probably right)
If anyone is at all interested it drives from this single, simple formula, and variations of:
=ImportHtml("
www.bom.gov.au/products/IDQ65119/IDQ65119.94590.shtml", "table", 3)