Question: Shawnee Mission East Choraliers performad in Cologne in a cathedral that was declared a World Heritage Site in which year ?

Context paragraphs:
Białowieża Forest: Białowieża Forest (Belarusian: Белавежская пушча, "Biełaviežskaja Pušča" ; Polish: "Puszcza Białowieska"   ] ; Russian: Беловежская пуща, "Belovezhskaya Pushcha" ) is one of the last and largest remaining parts of the immense primeval forest that once stretched across the European Plain.  The forest is home to 800 European bison, Europe's heaviest land animal.  UNESCO’s Man and the Biosphere Programme (MAB) designated the Polish Biosphere Reserve "Białowieża " in 1976 and the Belarusian Biosphere Reserve "Belovezhskaya Puschcha " in 1993.  In 2015, the Belarusian Biosphere Reserve occupied the area of 216,200 ha , subdivided into transition, buffer and core zones.  The forest has been designated a UNESCO World Heritage Site and an EU Natura 2000 Special Area of Conservation.  The World Heritage Committee by its decision of June 2014 approved the extension of the UNESCO World Heritage site “Belovezhskaya Pushcha/Białowieża Forest, Belarus, Poland”, which became “Białowieża Forest, Belarus, Poland”.  It straddles the border between Poland (Podlaskie Voivodeship) and Belarus (Brest and Grodno "voblast "s), and is 70 km north of Brest, Belarus and 62 km southeast of Białystok, Poland.  The Białowieża Forest World Heritage site covers a total area of 141,885 ha .

Cologne Cathedral: Cologne Cathedral (German: "Kölner Dom" , officially "Hohe Domkirche Sankt Petrus ", Latin: "Ecclesia Cathedralis Sanctorum Petri" , English: Cathedral Church of Saint Peter) is a Roman Catholic cathedral in Cologne, Germany.  It is the seat of the Archbishop of Cologne and of the administration of the Archdiocese of Cologne.  It is a renowned monument of German Catholicism and Gothic architecture and was declared a World Heritage Site in 1996.  It is Germany's most visited landmark, attracting an average of 20,000 people a day and currently the tallest twin-spired church at 157 m tall.

Shawnee Mission East High School: Shawnee Mission East High School is a public secondary school in Prairie Village, Kansas, US, for grades 9 through 12.  It is one of five high schools operated by the Shawnee Mission School District (Unified School District 512).

Spiritual Ambassador program: The Adventist Health System (AHS) has a Spiritual Ambassador program.  Two entities in the AHS, Shawnee Mission Medical Center and the Florida Hospital system, run large and very active Spiritual Ambassador programs.  Shawnee Mission Medical Center is located in Merriam, Kansas, which is part of the area of Shawnee Mission, Kansas.  Florida Hospital is a system of numerous hospitals, clinics and other types of outpatient centers in a large part of Florida.  Florida Hospital administers its Spiritual Ambassador program from the Florida Hospital Mission Development center in Orlando, Florida. Sometimes the Spiritual Ambassador program is called the SAFE program.  SAFE stands for Spiritual Ambassadors for Everyone.  To serve, one does not have to be an Adventist, but one does have to be a Christian.

Waldschlösschen Bridge: The Waldschlösschen Bridge (German: Waldschlößchenbrücke or Waldschlösschenbrücke ) is a road bridge across the Elbe river in Dresden.  The bridge was intended to remedy inner-city traffic congestion.  Its construction was highly controversial, as the Dresden Elbe Valley had been declared a UNESCO World Heritage Site and UNESCO expressed strong concerns against the bridge, noting its intent to withdraw the World Heritage title if the bridge were built.  As a result of this project, the Dresden Elbe Valley was listed in 2006 as an "Endangered World Heritage Site" (one of two in Europe, the Medieval Monuments in Kosovo being the other one), and in 2009 became only the second World Heritage Site to be de-listed.

Wet Tropics of Queensland: The Wet Tropics of Queensland World Heritage Site consists of approximately 8,940 km² of Australian wet tropical forests growing along the north-east Queensland portion of the Great Dividing Range.  The Wet Tropics of Queensland meets all four of the criteria for natural heritage for selection as a World Heritage Site.  World Heritage status was declared in 1988.  The Wet Tropics were added to the Australian National Heritage List in May 2007.

Shawnee Mission District Stadium: Shawnee Mission District Stadium is a multi-purpose sport stadium located in Overland Park, Kansas.  The facility is primarily used by Shawnee Mission North High School, Shawnee Mission Northwest High School and Shawnee Mission East High School, as well as FC Kansas City of the National Women's Soccer League.  Sporting Kansas City, then called the Kansas City Wizards, played at the stadium in a match against the Colorado Rapids during the 2008 Lamar Hunt U.S. Open Cup.

Cornwall and West Devon Mining Landscape: The Cornwall and West Devon Mining Landscape is a World Heritage Site which includes select mining landscapes in Cornwall and West Devon in the south west of England.  The site was added to the World Heritage List during the 30th Session of the UNESCO World Heritage Committee in Vilnius, July 2006.  Following plans in 2011 to restart mining at South Crofty, and to build a supermarket at Hayle Harbour, the World Heritage Committee drafted a decision in 2014 to put the site on the List of World Heritage in Danger, but this was rejected at the 38th Committee Session at Doha, Qatar (July 2014), in favour of a follow-up Reactive Monitoring Mission.

Shawnee Mission East Choraliers: The Shawnee Mission East Choraliers are a mixed chorus of more than 150 student singers, grades 10-12, at Shawnee Mission East High School in Prairie Village, Kansas.  The choir has performed in churches, cathedrals, schools, recitals and concert halls throughout Europe, singing from Galway to Rome and Leipzig to London.  The choir has performed at Carnegie Hall, Cologne Cathedral in Cologne, Germany, Great St. Mary's Cathedral in Cambridge, the Pantheon and at the Thomaskirche (St. Thomas Lutheran Church), a church in Leipzig, Germany where Johann Sebastian Bach held the position of cantor.

Shawnee Mission West High School: Shawnee Mission West High School is a fully accredited public high school located in Overland Park, Kansas, United States, serving students in grades 9-12.  Shawnee Mission West is one of several public high schools located within Shawnee Mission, KS.  The official school colors are black and gold and the school mascot is the Viking.

Supporting paragraphs: Shawnee Mission East Choraliers Cologne Cathedral
Answer: 1996