Question: What year was the choreographer of the ballet that was featured in a 2000 British dance drama film set during the 1984-85 coal miners' strike born?

Context paragraphs:
UK miners' strike (1984–85): The miners strike of 1984–85 was a major industrial action to shut down the British coal industry in an attempt to prevent colliery closures.  It was led by Arthur Scargill of the National Union of Mineworkers (NUM) against the National Coal Board (NCB), a government agency.  Opposition to the strike was led by the Conservative government of Prime Minister Margaret Thatcher, who called Scargill "the enemy within."  The NUM was divided over the action and many mineworkers, especially in the English Midlands, worked through the dispute.  Few major trade unions supported the NUM, primarily because of the absence of a vote at national level.  Violent confrontations between flying pickets and police characterised the year-long strike, which ended in a decisive victory for the Conservative government and led to the closure of most of Britain's collieries.  It was "the most bitter industrial dispute in British history."  At its height, the strike involved 142,000 mineworkers.  The number of days of work lost to the strike was over 26,000,000, making it the largest since the 1926 general strike.

Billy Elliot: Billy Elliot is a 2000 British dance drama film about a boy becoming a professional ballet dancer, set in north-eastern England during the 1984–85 coal miners' strike.  It was produced by Greg Brenman and Jon Finn, music composed by Stephen Warbeck, co-produced by BBC Films, Tiger Aspect Pictures and Working Title Films, distributed by Universal Pictures and Focus Features, written by Lee Hall and directed by Stephen Daldry.

The Last Nightingale: The Last Nightingale is an album by various artists recorded and released in 1984 to raise money for striking coal miners in the 1984–85 UK miners' strike.  It features Chris Cutler, Tim Hodgkinson and Lindsay Cooper from the English avant-rock group Henry Cow, singer and musician Robert Wyatt, and poet Adrian Mitchell.  The cover artwork was done by British cartoonist and caricaturist Ralph Steadman.

National Union of Mineworkers (Great Britain): The National Union of Mineworkers (NUM) is a trade union for coal miners in Great Britain, formed in 1945 from the Miners' Federation of Great Britain (MFGB).  The NUM took part in three national miners' strikes, in 1972, 1974 and 1984–85.  After the 1984–85 strike and the subsequent closure of most of Britain's coal mines, it became a much smaller union.  It had around 170,000 members when Arthur Scargill became leader in 1981, a figure which had fallen in 2015 to an active membership of around 100.

Cape Breton coal strike of 1981: The Cape Breton coal strike of 1981 was a strike by coal miners belonging to the United Mine Workers of America against the Cape Breton Development Corporation (DEVCO) of Cape Breton Island, Nova Scotia, Canada.  The strike, which was bitter and violent, began in the middle of July 1981, and ended in early October of that year.

Union of Democratic Mineworkers: The Union of Democratic Mineworkers (UDM) is a British trade union for coal miners based in Nottinghamshire, England.  Established in 1985 after a constitutional crisis in the National Union of Mineworkers, the UDM was given its certification on 6 December 1985, although it had effectively been in existence since the Nottinghamshire area of the NUM voted to secede from the federal union on 6 July 1985.  After the events of the strike in 1984-5, the Nottinghamshire area of the NUM was involved in a number of disputes with the National Executive Committee that led to a ballot in May on empowering the Nottingham Area Committee to disassociate from the NUM.  In ballots on 18 and 19 October on joining with Nottinghamshire in a new union, the South Derbyshire area of the NUM voted in favour by 51% and the Colliery Workers and Allied Trades Association (based mostly in Durham) voted in favour by almost 100%.

Harlan County, USA: Harlan County, USA is a 1976 Oscar-winning documentary film covering the "Brookside Strike", an effort of 180 coal miners and their wives against the Duke Power Company-owned Eastover Coal Company's Brookside Mine and Prep Plant in Harlan County, southeast Kentucky in 1973.  Directed and produced by Barbara Kopple, who has long been an advocate of workers' rights, "Harlan County, U.S.A." is less ambivalent in its attitude toward unions than her later "American Dream", the account of the Hormel Foods strike in Austin, Minnesota in 1985-86.

Adam Cooper (dancer): Adam Cooper (born 22 July 1971) is an English actor, choreographer, dancer and theatre director.  He currently works as both a performer and choreographer in musical theatre, and has choreographed and/or starred in award-winning shows such as "On Your Toes", "Singin' in the Rain" and "Grand Hotel".  He began his professional career as a dancer of classical ballet and contemporary ballet and is a former Principal of the Royal Ballet, a major international ballet company based in London.  He became internationally recognized for creating the lead role of Swan/Stranger in Matthew Bourne's contemporary dance production of the ballet "Swan Lake", a role that was briefly featured in the 2000 film "Billy Elliot".

1926 United Kingdom general strike: The 1926 general strike in the United Kingdom was a general strike that lasted 9 days, from 3 May 1926 to 12 May 1926.  It was called by the General Council of the Trades Union Congress (TUC) in an unsuccessful attempt to force the British government to act to prevent wage reduction and worsening conditions for 1.2 million locked-out coal miners.  Some 1.7 million workers went out, especially in transport and heavy industry.  The government was prepared and enlisted middle class volunteers to maintain essential services.  There was little violence and the TUC gave up in defeat.  In the long run, there was little impact on trade union activity or industrial relations.  Keith Laybourn says that historians mostly agree that, "In no significant way could the General Strike be considered a turning point or watershed in British industrial history."

Billy Elliot the Musical: Billy Elliot the Musical is a musical based on the 2000 film "Billy Elliot".  The music is by Elton John, and the book and lyrics are by Lee Hall, who wrote the film's screenplay.  The plot revolves around Billy, a British motherless boy who trades boxing gloves for ballet shoes.  The story of his personal struggle and fulfillment are balanced against a counter-story of family and community strife caused by the 1984–85 UK miners' strike in County Durham, in North Eastern England.  Hall's screenplay was inspired in part by A. J. Cronin's 1935 novel about a miners' strike, "The Stars Look Down", to which the musical's opening song pays homage.

Supporting paragraphs: Adam Cooper (dancer) Billy Elliot
Answer: 1971