the country's longest road tunnel until 2017. 1965 NAFTA agreement negotiated with Australia. Benmore Dam commissioned. Inter-Island HVDC commissioned, connecting the North and South Island power grids. Support for United States in Vietnam; New Zealand combat force sent, protest movement begins. Cook Islands becomes self-governing. 1 April: TEAL renamed Air New Zealand. Air New Zealand introduces the Douglas DC-8 jet aircraft on international routes. 1966 International airport officially opens at Auckland. New Zealand labour force reaches one million. National Library of New Zealand created. Te Atairangi Kaahu becomes first Māori Queen. 26 November: 1966 New Zealand general election, National wins a third term. 1967 Referendum extends hotel closing hours to 10pm. 10 July: Decimal currency introduced; New Zealand dollar replaces the pound at a rate of £1 to $2 (one shilling to 10 cents; one penny to cent) Lord Arthur Porritt becomes first New Zealand-born Governor-General. Denny Hulme becomes New Zealand's first (and currently only) Formula 1 World Champion. 1968 10 April: Inter-island ferry sinks in severe storm in Wellington Harbour; 51 people killed. 24 May: Three die in Inangahua earthquake. National Airways Corporation introduces Boeing 737 jet services on domestic routes. 1969 Vote extended to 20-year-olds. First output from Glenbrook Steel Mill. Television networked nationwide. Breath and blood tests introduced for suspected drunk drivers. 29 November: General election, National wins fourth election in a row. 1970s 1970 US Vice President Spiro Agnew Visits New Zealand to prop up the NZ Governments support for the Vietnam War and is met by an anti-war protest in Auckland which turns violent. Natural gas network commissioned, supplying gas from Kapuni to Auckland, Hamilton, New Plymouth, Whanganui, Palmerston North and Wellington. 1971 New Zealand secures continued access of butter and cheese to the United Kingdom. Nga Tamatoa protest at Waitangi celebrations. Tiwai Point aluminium smelter begins operating. Manapouri Power Station completed. Warkworth satellite station begins operation. 1972 Values Party is formed. Equal Pay Act passed. 25 November: General election. Labour Government elected; Norman Kirk becomes 29th Prime Minister. December: New Zealand ends its role in the Vietnam War when Troops are withdrawn under the new Labour Government and Compulsory Military Training is Abolished. 1973 Naval frigate dispatched in protest against French nuclear testing in the Pacific. New Zealand's population reaches three million. Oil price hike means worst terms of trade in 30 years. Colour TV introduced. 1974 1 April: Accident Compensation Corporation (ACC) established.