Tourism is an important industry for Australia's economy, representing 2.5% of GDP. There were over 6 million international visitor arrivals in 2012, a 3.7% increase from the previous year. Domestic tourism accounts for 73% of direct tourism GDP. The Australian government estimates the tourism industry could be worth $140 billion by 2020 based on trends. Popular destinations include Sydney, Melbourne, the Gold Coast, Great Barrier Reef, Uluru, and areas showcasing Australia's unique wildlife.