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:
| Head of mission | Tenure begins | Tenure ends | French Head of State | Japanese emperor |
| --- | --- | --- | --- | --- |
| Jean Daridan | 1959.0 | 1961.0 | Charles de Gaulle | Hirohito |
| Étienne Dennery | 1961.0 | 1964.0 | Charles de Gaulle | Hirohito |
| François Missoffe | 1964.0 | 1966.0 | Charles de Gaulle | Hirohito |
| Louis de Guiringaud | 1966.0 | 1972.0 | Georges Pompidou | Hirohito |
| François Lefebvre de Laboulaye | 1972.0 | 1975.0 | Valéry Giscard d'Estaing | Hirohito |
| Jean-Pierre Brunet | 1975.0 | 1977.0 | Valéry Giscard d'Estaing | Hirohito |
| Louis Dauge | 1977.0 | 1979.0 | Valéry Giscard d'Estaing | Hirohito |
| Xavier Daufresne de la Chevalerie | 1979.0 | 1982.0 | François Mitterrand | Hirohito |
| André Ross | 1982.0 | 1985.0 | François Mitterrand | Hirohito |
| Gilbert Pérol | 1985.0 | 1987.0 | François Mitterrand | Hirohito |
| Bernard Dorin | 1987.0 | 1991.0 | François Mitterrand | Akihito |
| Loïc Hennekinne | 1991.0 | 1993.0 | François Mitterrand | Akihito |
| Jean-Bernard Ouvrieu | 1993.0 | 1998.0 | Jacques Chirac | Akihito |
| Maurice Gourdault-Montagne | 1998.0 | 2002.0 | Jacques Chirac | Akihito |
| Bernard Faubournet de Montferrand | 2002.0 | 2006.0 | Jacques Chirac | Akihito |
| Gildas Le Lidec | 2006.0 | 2007.0 | Jacques Chirac | Akihito |
Question:
How many French heads of state have a head of mission of Xavier Daufresne de la Chevalerie?
Answer:
1.0