 As of February 2015, Arts and recreation services was the strongest industry in Australia by total number of employed persons growing by 20.59% since the same time in 2013.The visual arts have a long history in Australia, dating back around 30,000 years, and examples of ancient Aboriginal rock art can be found throughout the continent, notably in national parks such as the UNESCO-listed sites at Uluru and Kakadu National Park in the Northern Territory, and also within protected parks in urban areas such as Ku-ring-gai Chase National Park in Sydney.In the mid-twentieth century, the landscape paintings of Albert Namatjira were popular and received national and international acclaim.