Question: The UN Campus, Bonn was opened by Secretary-General that served when?
Context: The UN City (Danish: FN Byen) is located in Copenhagen, and consists of two campuses that combined house nine United Nations agencies.  The plans for a UN City in Copenhagen were born in 2002, and the location at Marmormolen was selected in 2005.  Campus 1 on Marmormolen currently accommodates staff members from all nine agencies.  Campus 2, located by the container port, constitutes UNICEF’s new state of the art high bay warehouse and is currently considered to be the world's largest non-food humanitarian warehouse.  UN City currently accommodates 1,200 employees from 104 different countries, but has room for an estimated 1,700 employees, making it the sixth largest UN campus measured by the amount of staff.  The building was designed by Danish architecture firm 3XN, totals 45,000 m office space and 7,000 m basement and was inaugurated on the 4th of July 2013 by Secretary-General Ban Ki-moon and Her Majesty Margrethe II of Denmark.  The building is built with a large focus on sustainability and environmental friendliness, and the calculated energy consumption for the building is less than 50 kWh/m/year.  The building has been awarded with the European Commission's Green Building Award for New Buildings and LEED's Platinum-certificate.  The Danish Ministry of Foreign Affairs rent UN City for the UN through official development assistance funds. Kofi Atta Annan ( ; born 8 April 1938) is a Ghanaian diplomat who served as the seventh Secretary-General of the United Nations from January 1997 to December 2006.  Annan and the UN were the co-recipients of the 2001 Nobel Peace Prize.  He is the founder and chairman of the Kofi Annan Foundation, as well as chairman of The Elders, an international organization founded by Nelson Mandela. Chapter XV of the United Nations Charter deals with the UN Secretariat.  It designates the UN Secretary-General as the chief administrative officer of the organization, which includes the staff of ECOSOC, the Trusteeship Council, and other organs.  Similarly to how the US Constitution requires the US President to deliver a State of the Union address to the US Congress, Article 98 of the UN Charter requires the Secretary-General to "make an annual report to the General Assembly on the work of the Organization."  Article 101 specifies criteria for employment at the UN, stating, "The paramount consideration in the employment of the staff and in the determination of the conditions of service shall be the necessity of securing the highest standards of efficiency, competence, and integrity.  Due regard shall be paid to the importance of recruiting the staff on as wide a geographical basis as possible."  Chapter XV is analogous to Article 6 of the Covenant of the League of Nations. Jamal Benomar (Arabic: جمال بنعمر‎ ‎ ; born c. April 1957) is the Special Adviser to the United Nations Secretary-General on Conflict Prevention, at the level of Under Secretary-General (USG).  His 25-year diplomatic career at the UN has focused on peacebuilding and governance issues in conflict countries, including Yemen, Afghanistan and Iraq.  He holds a PHD from the University of London and has lectured at the University of Paris VII.  He previously worked for the Carter Center and Amnesty International.  On 9 November 2015, he was appointed as the UN Secretary-General's Special Adviser for Conflict Prevention.  He most recently led the UN response to the political crisis in Burundi. The University Hospital Bonn is the tertiary referral academic teaching hospital associated with the University of Bonn.  It is located at University of Bonn - Campus Venusberg, Bonn-Venusberg, Bonn, Germany.  It is among the leading hospitals in Germany and Europe, providing excellent patient care and research.  Since 2008 the German Center for Neurodegenerative Diseases (DZNE) is being established on the hospital site The UN Campus in Bonn, Germany, is seat to 18 organizations of the United Nations.  It was opened in July 2006 by then-Secretary-General Kofi Annan and then-Chancellor of Germany Angela Merkel and expanded in July 2013. Rebeca Grynspan Mayufis (born 1955) is a Costa Rican economist, the Secretary General of SEGIB, the Ibero-American Secretary General, a former UN Under-Secretary-General, and the Associate Administrator of the United Nations Development Programme (UNDP) appointed by UN Secretary-General Ban Ki-moon.  She was the Vice President of Costa Rica from 1994 to 1998.  Grynspan previously served as Director of UNDP's Regional Bureau for Latin America and the Caribbean, appointed to the position by United Nations Secretary-General Kofi Annan in December 2005. Langer Eugen (English: "Tall Eugene") is an office tower in the Gronau district of Bonn, Germany.  It was built between 1966 and 1969.  Since 2006 it has housed several United Nations organizations.  Until the German Bundestag (parliament) moved to Berlin in 1999, the building was the primarily location for the offices of the members of the Bundestag.  After renovations, eleven UN organizations moved into the building and it began serving as the center of the UN Campus, Bonn.  Langer Eugen is protected as a landmark or listed building under the North Rhine-Westphalia Monument Protection Law.  It is currently the second-tallest building in Bonn and the 43rd tallest building in Germany (excluding non-habitable structures such as radio and observation towers, steeples, and chimneys).  When it was built it was briefly the second-tallest building in Germany, behind the Bayer-Hochhaus. Ahmad Alhendawi (أحمد الهنداوي) (born 20 May 1984) currently serves as the Secretary-General of the World Organizations of the Scout Movement, the youngest in the history of the organization.  Prior to this, he was the first-ever United Nations Secretary-General's Envoy on Youth, appointed by the Secretary-General of the United Nations on January 17, 2013 as the youngest senior official in the history of the United Nations.  He supported UN Secretary-General Ban Ki-moon in addressing his thematic priority of working with and for young people as part of his current Five-Year Action Agenda. Luiz Carlos da Costa (4 June 1949 – 12 January 2010) was an international civil servant working for the United Nations.  Originally from Brazil, Costa joined the United Nations in 1969 and stayed with the organization for the remainder of his life.  His last assignment was as the Principal Deputy Special Representative of the Secretary-General for Haiti and second in command of the UN Stabilization Mission in Haiti (MINUSTAH).  He died together with his superior, Tunisian Hédi Annabi, in the 2010 Haiti earthquake.  On 18 January 2010, UN Secretary-General Ban Ki-moon and several high-ranking UN officials traveled from New York to Port-au-Prince to see the devastation firsthand.  Mr. Ban hosted a small memorial service with both men's families at the airport in Port-au-Prince.
Answer: January 1997 to December 2006