The Mining industry is an important part of the Australian economy. Mining accounts for approximately 5% of GDP, although this jumped to 7.5% in 2005-06. Over the last 5 years the volume of output produced by the industry has not changed to any significant extent, even though its income has grown by more than 85%. Mining exports account for a significant proportion of Australia's total exports, around 38% in value terms in 2005-06.