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:
| Office | Type | Location | Elected | Term began | Term ended |
| --- | --- | --- | --- | --- | --- |
| Mayor | Executive | San Francisco | N/A | December 4, 1978 | January 8, 1980 |
| Mayor | Executive | San Francisco | 1979 | January 8, 1980 | January 8, 1984 |
| Mayor | Executive | San Francisco | 1983 | January 8, 1984 | January 8, 1988 |
| Senator | Legislature | Washington, D.C. | 1992 | November 4, 1992 | January 3, 1995 |
| Senator | Legislature | Washington, D.C. | 1994 | January 3, 1995 | January 3, 2001 |
| Senator | Legislature | Washington, D.C. | 2000 | January 3, 2001 | January 3, 2007 |
| Senator | Legislature | Washington, D.C. | 2006 | January 3, 2007 | January 3, 2013 |
Question:
When did the term began when the date of election is N/A?
Answer:
December 4, 1978