Question: When did the country with a co-official language used in the film titled after the city that is the final resting place of Tito first attend the Olympics games?

Knowledge 1: Belgrade (film)
Belgrade (also known as Belgrade with Boris Malagurski) is a 2013 Serbian documentary film directed by Boris Malagurski about Belgrade, the capital of Serbia. The documentary film had its world premiere on 19 October 2013 at Sava Centar in Belgrade and was aired on Radio Television Serbia on 20 October 2014. [SEP] Knowledge 2: Serbian language
Serbian (српски / srpski, pronounced [sr̩̂pskiː]) is the standardized variety of the Serbo-Croatian language mainly used by Serbs. It is the official language of Serbia, co-official in the territory of Kosovo, and one of the three official languages of Bosnia and Herzegovina. In addition, it is a recognized minority language in Montenegro, where it is spoken by the relative majority of the population, as well as in Croatia, North Macedonia, Romania, Hungary, Slovakia, and the Czech Republic. [SEP] Knowledge 3: Josip Broz Tito
Every year a "Brotherhood and Unity" relay race is organized in Montenegro, Macedonia and Serbia which ends at the "House of Flowers" in Belgrade on May 25 – the final resting place of Tito. At the same time, runners in Slovenia, Croatia and Bosnia and Herzegovina set off for Kumrovec, Tito's birthplace in northern Croatia. The relay is a left-over from Yugoslav times, when young people made a similar yearly trek on foot through Yugoslavia that ended in Belgrade with a massive celebration. [SEP] Knowledge 4: Yugoslavia at the Olympics
Federal Republic of Yugoslavia, formed as a joint state by only Montenegro and Serbia after the breakup of Yugoslavia, from 1992–2002 (due to UN ban allowed to compete as Independent Olympic Participants at the 1992 Summer Olympics and was not allowed to compete at 1994 Winter Olympics)Two of the successor nations (Croatia and Slovenia) began to compete as independent teams at the Olympics starting at the 1992 Winter Games and Bosnia and Herzegovina at the 1992 Summer Games and as of the 2008 Summer Olympics, all six successor nations, former socialist republics, have participated independently. Kosovo, a former autonomous province, made its Olympic debut as an independent national team at the 2016 Summer Olympics.
Knowledge 1: Josip Broz Tito
Every year a "Brotherhood and Unity" relay race is organized in Montenegro, Macedonia and Serbia which ends at the "House of Flowers" in Belgrade on May 25 – the final resting place of Tito. At the same time, runners in Slovenia, Croatia and Bosnia and Herzegovina set off for Kumrovec, Tito's birthplace in northern Croatia. The relay is a left-over from Yugoslav times, when young people made a similar yearly trek on foot through Yugoslavia that ended in Belgrade with a massive celebration. [SEP] Knowledge 2: Belgrade (film)
Belgrade (also known as Belgrade with Boris Malagurski) is a 2013 Serbian documentary film directed by Boris Malagurski about Belgrade, the capital of Serbia. The documentary film had its world premiere on 19 October 2013 at Sava Centar in Belgrade and was aired on Radio Television Serbia on 20 October 2014. [SEP] Knowledge 3: Serbian language
Serbian (српски / srpski, pronounced [sr̩̂pskiː]) is the standardized variety of the Serbo-Croatian language mainly used by Serbs. It is the official language of Serbia, co-official in the territory of Kosovo, and one of the three official languages of Bosnia and Herzegovina. In addition, it is a recognized minority language in Montenegro, where it is spoken by the relative majority of the population, as well as in Croatia, North Macedonia, Romania, Hungary, Slovakia, and the Czech Republic. [SEP] Knowledge 4: Yugoslavia at the Olympics
Federal Republic of Yugoslavia, formed as a joint state by only Montenegro and Serbia after the breakup of Yugoslavia, from 1992–2002 (due to UN ban allowed to compete as Independent Olympic Participants at the 1992 Summer Olympics and was not allowed to compete at 1994 Winter Olympics)Two of the successor nations (Croatia and Slovenia) began to compete as independent teams at the Olympics starting at the 1992 Winter Games and Bosnia and Herzegovina at the 1992 Summer Games and as of the 2008 Summer Olympics, all six successor nations, former socialist republics, have participated independently. Kosovo, a former autonomous province, made its Olympic debut as an independent national team at the 2016 Summer Olympics.
Knowledge 1: Josip Broz Tito
Every year a "Brotherhood and Unity" relay race is organized in Montenegro, Macedonia and Serbia which ends at the "House of Flowers" in Belgrade on May 25 – the final resting place of Tito. At the same time, runners in Slovenia, Croatia and Bosnia and Herzegovina set off for Kumrovec, Tito's birthplace in northern Croatia. The relay is a left-over from Yugoslav times, when young people made a similar yearly trek on foot through Yugoslavia that ended in Belgrade with a massive celebration. [SEP] Knowledge 2: Belgrade (film)
Belgrade (also known as Belgrade with Boris Malagurski) is a 2013 Serbian documentary film directed by Boris Malagurski about Belgrade, the capital of Serbia. The documentary film had its world premiere on 19 October 2013 at Sava Centar in Belgrade and was aired on Radio Television Serbia on 20 October 2014. [SEP] Knowledge 3: Yugoslavia at the Olympics
Federal Republic of Yugoslavia, formed as a joint state by only Montenegro and Serbia after the breakup of Yugoslavia, from 1992–2002 (due to UN ban allowed to compete as Independent Olympic Participants at the 1992 Summer Olympics and was not allowed to compete at 1994 Winter Olympics)Two of the successor nations (Croatia and Slovenia) began to compete as independent teams at the Olympics starting at the 1992 Winter Games and Bosnia and Herzegovina at the 1992 Summer Games and as of the 2008 Summer Olympics, all six successor nations, former socialist republics, have participated independently. Kosovo, a former autonomous province, made its Olympic debut as an independent national team at the 2016 Summer Olympics. [SEP] Knowledge 4: The White Suit
The White Suit () is a 1999 Serbian language film directed by Lazar Ristovski. It was a co-production between the United Kingdom and Federal Republic of Yugoslavia. It was Yugoslavia's official Best Foreign Language Film submission at the 72nd Academy Awards, but did not manage to receive a nomination.

Answer: 2016