Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | College | Years | Reign |
| --- | --- | --- | --- |
| Seretse Khama | Balliol | 1945 | King of the BagammaNgwato people (1925); afterwards first President of Botswana (1966–1980) |
| Jigme Khesar Namgyal Wangchuck | Magdalen | 2000–? | King of Bhutan (2006 onwards) |
| Abdullah II of Jordan | Pembroke |  | King of Jordan (1999 onwards) |
| Sultan Ahmad Shah | Worcester | 1948–? | King of Malaysia (1979–1984) and Sultan of Pahang (1979 onwards) |
| Tuanku Abdul Halim | Wadham | –1954 | King of Malaysia (1970–1975) and Sultan of Kedah (1958 onwards) |
| Tuanku Jaafar | Balliol |  | King of Malaysia (1994–1999) and Yang di-Pertuan Besar of Negeri Sembilan (1968 onwards) |
| William II of the Netherlands |  |  | King of the Netherlands and Grand Duke of Luxembourg (1840–1849) |
| Harald V of Norway | Balliol | 1960–1962 | King of Norway (1991 onwards) |
| Olav V of Norway | Balliol | 1924–1926 | King of Norway (1957–1991) |
| Vajiravhud | Christ Church | 1900–1901 | King of Siam (1910–1925) |
| Andrew Bertie | Christ Church |  | Prince and Grand Master of the Sovereign Military Order of Malta (1988-2008) |
| George Tupou V |  |  | King of Tonga (2006-2012) |
Question:
how long was harald v of norway the king of norway at the university of oxford?
Answer:
2 years