Gateside - I noticed you've added an image or chart above but I can only see a red cross unfortunately. I think I've now found what I was looking for (with your pointer to the asx epic code - thx) : ASX 25 year chart -
This gives an approximate annual compound growth rate over close on 25 yrs of 9.3%
ie 2835[today] = 306[starting price] x (1.093 to the power of 25[years]) ...roughly!