vulnerable, or threatened vertebrate species classified by the state or Commonwealth governments. Because of a reliance on roads and private vehicle transport, and a high concentration of animal populations divided by this development, Tasmania has the worst (per kilometre) roadkill rate in the world, with 32 animals killed per hour and at least 300,000 per year. Protected areas of Tasmania cover 21% of the island's land area in the form of national parks. The Tasmanian Wilderness World Heritage Area (TWWHA) was inscribed by UNESCO in 1982, where it is globally significant because "most UNESCO World Heritage sites meet only one or two of the ten criteria for that status. The Tasmanian Wilderness World Heritage Area (TWWHA) meets 7 out of 10 criteria. Only one other place on earth—China’s Mount Taishan—meets that many criteria". Controversy surrounds the decision in 2014 by the Abbott federal Liberal government to request the area's delisting and opening for resource exploration (before it was rejected by the UN Committee at Doha), and the current mining and deforestation in the state's Tarkine region, the largest single temperate rainforest in Australia. Demography Tasmania's population is more homogeneous than that of other states of Australia, with many of Irish and British descent. Approximately 65% of its residents are descendants of an estimated 10,000 "founding families" from the mid-19th century. Until 2012, Tasmania was the only state in Australia with an above-replacement total fertility rate; Tasmanian women had an average of 2.24 children each. By 2012 the birth rate had slipped to 2.1 children per woman, bringing the state to the replacement threshold, but it continues to have the second-highest birth rate of any state or territory (behind the Northern Territory). Major population centres include Hobart, Launceston, Devonport, Burnie, and Ulverstone. Kingston is often defined as a separate city but is generally regarded as part of the Greater Hobart Area. Ancestry and immigration At the 2016 census, the most commonly nominated ancestries were: 19.3% of the population was born overseas at the 2016 census. The five largest groups of overseas-born were from England (3.7%), New Zealand (1%), Mainland China (0.6%), Scotland (0.4%) and the Netherlands (0.4%). 4.6% of the population, or 23,572 people, identified as Indigenous Australians (Aboriginal Australians and Torres Strait Islanders) in 2016. Language At the , 86.1% of inhabitants spoke only English at home, with the next most common languages being Mandarin (1.5%), Nepali (1.3%), Punjabi (0.5%)