The following animation looks at the changes to the Australian economy between Q3 in 1974 and Q1 in 2012. Each industry sector is plotted as a percent of the gross valued added of all sectors. The data comes from the industry gross value added table in the national accounts.
The standout item is the decline of manufacturing over the period. While a little volatile, the proportion of the economy contributed by the mining industry grew a lot less than I had expected. The big growth is in finance and insurance services.
For simpler comparative purposes, the next two charts are the first and last slides in the above animation.
(Technical note: Trend data from table 6 of the National Accounts)