largest protest during the Diretas Já civil unrest, as well as the largest public demonstration in the history of Brazil. The elections are granted in 1989. April 19 – Advance Australia Fair is proclaimed as Australia's national anthem, and green and gold as the national colours. April 24 – An X-class solar flare erupts on the Sun. April 26 – Sultan Iskandar of Johor becomes Yang di-Pertuan Agong of Malaysia, in succession to Sultan Ahmad Shah, whose term ended the previous day. May May 2 – South Africa, Mozambique and Portugal sign an agreement on electricity supply from the Cahora Bassa dam. May 5 The Herreys' song Diggi-Loo Diggi-Ley wins the Eurovision Song Contest for Sweden in Luxembourg. It subsequently became a top ten hit in five European countries. The Itaipu Dam, on the border of Brazil and Paraguay after nine years of construction, begins generating power; it was the largest hydroelectric dam in the world at the time. May 8 – The Soviet Union announces that it will boycott the 1984 Summer Olympics in Los Angeles. May 11 – A transit of Earth from Mars takes place. May 12 – The Louisiana World Exposition, also known as the 1984 World's Fair, opens. May 13 – Severomorsk Disaster: an explosion at the Soviets' Severomorsk Naval Base destroys two-thirds of all the missiles stockpiled for the Soviets' Northern Fleet. The blast also destroys workshops needed to maintain the missiles as well as hundreds of technicians. Western military experts called it the worst naval disaster the Soviet Navy has suffered since WWII. May 14 – The one-dollar coin is introduced in Australia. May 23 – A methane gas explosion at Abbeystead water treatment works in Lancashire, UK, kills 16 people. May 30 – Liverpool beat Roma 5-2 after penalties in the final of the 1984 European Cup football tournament. June June 5 – The Indian government begins Operation Blue Star, the planned attack on the Golden Temple in Amritsar. June 6 – Tetris is officially released in the Soviet Union on the Electronika 60. June 8 – A F5 tornado nearly destroys the town of Barneveld, Wisconsin, killing nine people, injuring nearly 200, and causing over $25,000,000 in damage. June 16 – The Canadian entertainment company, Cirque du Soleil, is founded. June 22 – Virgin Atlantic makes its inaugural flight. June 27 – France beats Spain 2–0 to win Euro 84. June