Hey Paddy,
I found a Google Finance link to the current price, so I was able to plug that into my spreadsheet that I created. The link for that is =GOOGLEFINANCE("INDEXASX:Xjt").
I think I got my approximate starting index value from a chart for the date I wanted to compare from, but didn't ever find historical pricing data like you are after.
Let me know if you do find it somewhere.
All Ordinaries Total Return Index (XAOA) historical prices, page-3
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