at Riverton in the South Island in 1837. The Pohutukawa Trust New Zealand received a Green Ribbon Award from the Ministry for the Environment in 2003 "for outstanding leadership and commitment to environmental protection". Department of Conservation controlled land About 10% of the island is under the control of the Department of Conservation, which tries to keep the protected areas free of invasive pests and animals. As at 2002, Kawau Island was home to the largest island population of North Island weka. Demographics Kawau Island is in an SA1 statistical area which covers and includes Motuora, Moturekareka Island, Motuketekete Island, Takangaroa Island and Rabbit Island, all of which are uninhabited. The SA1 area is part of the larger Gulf Islands statistical area. The SA1 statistical area had a population of 81 at the 2018 New Zealand census, an increase of 3 people (3.8%) since the 2013 census, and unchanged since the 2006 census. There were 45 households, comprising 42 males and 42 females, giving a sex ratio of 1.0 males per female. The median age was 60.3 years (compared with 37.4 years nationally), with 6 people (7.4%) aged under 15 years, 3 (3.7%) aged 15 to 29, 45 (55.6%) aged 30 to 64, and 30 (37.0%) aged 65 or older. Ethnicities were 96.3% European/Pākehā and 7.4% Māori. People may identify with more than one ethnicity. Although some people chose not to answer the census's question about religious affiliation, 48.1% had no religion, 37.0% were Christian and 3.7% had other religions. Of those at least 15 years old, 18 (24.0%) people had a bachelor's or higher degree, and 18 (24.0%) people had no formal qualifications. The median income was $24,600, compared with $31,800 nationally. 12 people (16.0%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 24 (32.0%) people were employed full-time and 21 (28.0%) were part-time. Gulf Islands The statistical area of Gulf Islands also includes Rangitoto Island, Motutapu Island, Browns Island, Motuihe Island and Rakino Island, but Kawau Island has the majority of the population. Gulf Islands covers and had an estimated population of as of with a population density of people per km2. Gulf Islands had a population of 111 at the 2018 New Zealand census, a decrease of 9 people (−7.5%) since the 2013 census, and a decrease of 30 people (−21.3%) since the 2006 census. There were 63