Name the Secretary Generals of the United Nations and their countries of origin:
- 1946-1952
- 1953-1961
- 1961-1971
- 1972-1981
- 1982-1991
- 1992-1996
- 1997-2006
- 2007-2016
- 2017-present
- Trygve Lie (Norway)
- Dag Hammarskjöld (Sweden)
- U Thant (Burma) (currently known as Myanmar)
- Kurt Waldheim (Australia)
- Javier Perez De Cuellar (Peru)
- Boutros Boutros Ghali (Egypt)
- Kofi A. Annan (Ghana)
- Ban Ki-Moon ( South Korea)
- Antonio Guterres (Portugal)
