Question: In which year did this city file the municipal bankruptcy, whose decline was documented in the 2012 documentary film, "Detropia?"
Context: Ping Pong "(Never too old for gold)" is a 2012 documentary film, that follows eight pensioners from around the world as they train for and compete in the over 80's table tennis world championship in Inner Mongolia.  The film's world premiere took place at Hot Docs Canadian International Documentary Festival in Toronto.  It has since appeared at Sheffield Doc/Fest (and was pitched at the Doc/Fest's 2010 MeetMarket), DMZ International Documentary Film Festival, Zurich Film Festival, Calgary International Film Festival, Warsaw International Film Festival, Mumbai Film Festival, Guelph Festival of Moving Media, and San Francisco Doc Fest.  The film opened in the UK with a theatrical release on 6 July 2012 and has since been shown at cinemas across the UK.  It premiered in the US at DOC NYC in November 2012. The Detroit Water and Sewerage Department (DWSD) is a public utility that provides water and sewerage services for Detroit, Michigan and owns the assets that provide water and sewerage services to 126 other communities in seven counties.  It is one of the largest water and sewer systems in the United States.  In 2000, the utility utilized five water treatment plants using water from the Detroit River and Lake Huron.  In mid 2014, DWSD had acquired significant debt and delinquent accounts, and talks of privatization were occurring.  As of January 1, 2016, under the terms of the City of Detroit's municipal bankruptcy the Great Lakes Water Authority (GLWA) was created with a $50 million annual lease agreement to the City of Detroit for 40 years, while DWSD bifurcated to focus its services specifically on the water and sewer customers within only the city of Detroit. The city of Detroit, Michigan, filed for Chapter 9 bankruptcy on July 18, 2013.  It is the largest municipal bankruptcy filing in U.S. history by debt, estimated at $18–20 billion, exceeding Jefferson County, Alabama's $4-billion filing in 2011.  Detroit is also the largest city by population in the U.S. history to file for Chapter 9 bankruptcy, more than twice as large as Stockton, California, which filed in 2012.  Detroit’s population has declined from a peak of 1.8 million in 1950; in July 2013, "The New York Times" called the city “home to 700,000 people, as well as to tens of thousands of abandoned buildings, vacant lots and unlit streets.” Do You Really Want To Know?  is a 2012 documentary film directed by John Zaritsky and produced by Kevin Eastwood.  Using interviews and dramatic recreations, the film recounts the stories of three families who carry the gene for Huntington's Disease, a neurodegenerative illness which is the result of a genetic abnormality, whose symptoms typically appear in mid-life.  Members of each featured family have undergone predictive testing to learn whether or not they have inherited the gene that causes the disease, and they each describe the impact that testing has had upon their lives.  "Do You Really Want To Know?"  had its world premiere in Canada at the 2012 DOXA Documentary Film Festival and its broadcast premiere on November 13, 2012 on Knowledge Network. Soap Life is a 2012 documentary film produced by New York Production Services that chronicles the decline of daytime television dramas and the prospective future of the genre. Patrick C. Shea is an attorney in California.  He was the federal court-appointed attorney that represented 170-plus municipal entities with investments of over $5 billion in the Orange County, California Chapter 9 bankruptcy.  On December 6, 1994, the County of Orange declared Chapter 9 bankruptcy, from which it emerged in June 1995.  The Orange County bankruptcy was the largest municipal bankruptcy in U.S. history.  Following a tumultuous several year period of financial disclosures by the City of San Diego relating to its massively underfunded pension and retiree health care system, in 2005 Shea ran for mayor of San Diego on a platform of filing a Chapter 9 bankruptcy for the city in order to restructure its troubled financial condition. The Atlanta International Documentary Film Festival (also called DocuFest Atlanta, Atlanta DocuFest, and DocuFest) is a film festival that screens documentary films in Atlanta, Georgia, United States.  Paul Mariano's "Also Ran" was named Best Political Documentary at the 2006 festival.  Don Wilson's "Mississippi Son: A Filmmaker's Journey Home" was named Best Dramatic Documentary at the 2007 festival.  In 2009, Roger Nygard's "The Nature of Existence" was screened at the festival, as was Mike Ramsdell's "The Anatomy of Hate: A Dialogue for Hope", which won the Audience Choice Award that year.  LGBT documentary film "It Doesn’t Define Us" was screened at the 2010 festival. " The Cartel", a documentary about state schools in New Jersey, won the festival's Audience Choice Award that year.  At the 2012 festival, Christine Anthony's and Owen Masterson's "Grow!"  won the Audience Choice Award.  "Decadence: Decline of the Western World" was named that year's Best Foreign Documentary. The city of Detroit, in the U.S. state of Michigan, has gone through a major economic and demographic decline in recent decades.  The population of the city has fallen from a high of 1,850,000 in 1950 to 677,116 in 2015, kicking it off the top 20 of US cities by population for the first time since 1850.  The city's automobile industry has suffered from global competition and has moved much of the remaining production out of Detroit.  Local crime rates are among the highest in the United States, and vast areas of the city are in a state of severe urban decay.  In 2013, Detroit filed the largest municipal bankruptcy case in U.S. history, which it successfully exited on December 10, 2014.  However, poverty, crime, and urban blight in Detroit continue to be ongoing problems. Never Cry Wolf is a 1983 American drama film directed by Carroll Ballard.  The film is an adaptation of Farley Mowat's 1963 autobiography "Never Cry Wolf" and stars Charles Martin Smith as a government biologist sent into the wilderness to study the caribou population, whose decline is believed to be caused by wolves, even though no one has seen a wolf kill a caribou.  The film also features Brian Dennehy and Zachary Ittimangnaq.  It was the first Disney film to be released under the new Walt Disney Pictures label. Detropia is a 2012 documentary film, directed by Heidi Ewing and Rachel Grady, about the city of Detroit, Michigan.  It focuses on the decline of the economy of Detroit due to long-term changes in the automobile industry, and the effects that the decline has had on the city's residents and infrastructure.
Answer: 2013