Question: In what country is the company headquartered where Walter van de Vijver was the head of exploration and production until 2004?

Context articles: Royal Dutch Shell
Frank Van De Vijver
Walter van de Vijver
VIER
William T. Van de Graaff
Fons van de Vijver
Andorra in the Eurovision Song Contest 2005
Heidi Van De Vijver
Arthur Van De Vijver
Wouter Vandenhaute

Royal Dutch Shell plc (, ), commonly known as Shell, is a British–Dutch multinational oil and gas company headquartered in the Netherlands and incorporated in the United Kingdom.
 It is one of the six oil and gas "supermajors" and the sixth-largest company in the world measured by 2016 revenues (and the largest based in Europe).
 Shell was first in the 2013 Fortune Global 500 list of the world's largest companies; in that year its revenues were equivalent to 84% of the Netherlands' $556 billion GDP.
Frank Van De Vijver (born 12 November 1962) is a Belgian former professional racing cyclist.
 He rode in the 1987 Tour de France.
Walter van de Vijver (born November 1955) was the head of exploration and production at Royal Dutch Shell.
 He was dismissed in 2004 following a scandal about the size of the company's reserves.
VIER (strive) is a Belgian-Flemish commercial television channel.
 It is part of De Vijver Mediaholding and production company Woestijnvis.
William Travis "Bully" Van de Graaff (October 25, 1895 – April 26, 1977) was an American football player, coach, and college athletics administrator.
 He attended Tuscaloosa High School.
 He played college football at the University of Alabama, where he was selected as an All-American in 1915, Alabama's first.
 He was 6'1" 187 pounds.
 "Bully" was placed on an "Associated Press" Southeast Area All-Time football team 1869-1919 era.
 Van de Graaff served as the head football coach at Colorado College from 1926 to 1939, compiling a record of 49–47–6.
 He coached hall of famer Dutch Clark.
 He died in Colorado Springs, Colorado on April 26, 1977 at the age of 81.
 He was the older brother of physicist Robert J. Van de Graaff, the designer of the Van de Graaff generator which produces high voltages. Bully's two older brothers, Hargrove and Adrian, were also Alabama football players.
Alphonsius Josephus Rachel (Fons) van de Vijver (born 4 October 1952, Koewacht) is a Dutch psychologist and Professor of Cross-Cultural Psychology at the Tilburg University, the North-West University and the University of Queensland, known for his work on cross-cultural research and on "methods and data analysis of comparative research".
Andorra was represented by Marian van de Wal with the song "La mirada interior", which was chosen over two stages organized by Andorran Television.
 Andorra began their search for a representative with Eurocàsting 2004, which eventually narrowed down 32 competitors into only 3.
 Marian van de Wal, Mar Capdevila, and Ishtar Ruiz each performed two song in the final.
 After a tie between Marian van de Wal and Mar Capdevila, the youngest jury member selected Marian van de Wal to represent Andorra at the 2005 Eurovision Song Contest.
 On January 22, Marian van de Wal performed three candidate songs in a show hosted by Meri Picart & Josep Lluís Trabal.
 A combination of SMS Voting and a professional jury selected "La Mirada Interior".
Heidi Van De Vijver (born 31 December 1969) is a former Belgian racing cyclist.
 She won the Belgian national road race title in 1994 and 1998.
 She also competed at the 1996 and 2000 Summer Olympics.
Arthur Van De Vijver (29 February 1948 – 9 March 1992) was a Belgian racing cyclist.
 He rode in the 1974 Tour de France.
Wouter Vandenhaute (born 16 February 1962) is a Belgian Entrepreneur, Television producer and former sports-journalist.
 He is currently managing director of the Belgian media holding De Vijver, which includes the TV production company Woestijnvis and TV channel VIER.