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:
| Team | Outgoing manager | Manner of departure | Date of vacancy | Replaced by | Date of appointment | Position in table |
| --- | --- | --- | --- | --- | --- | --- |
| Valladolid | Javier Clemente | End of contract | 31 May 2010 | Antonio Gómez | 23 June 2010 | 18th (in La Liga ) |
| Tenerife | Gonzalo Arconada | Sacked | 20 September 2010 | Alfredo Merino (as caretaker) | 21 September 2010 | 22nd |
| Tenerife | Alfredo Merino | End of tenure as caretaker | 27 September 2010 | Juan Carlos Mandiá | 27 September 2010 | 22nd |
| Recreativo | Pablo Alfaro | Sacked | 17 October 2010 | Carlos Ríos | 18 October 2010 | 21st |
| Valladolid | Antonio Gómez | Sacked | 29 November 2010 | Javier Torres Gómez (as caretaker) | 29 November 2010 | 7th |
| Gimnàstic | Luis César Sampedro | Sacked | 6 December 2010 | Juan Carlos Oliva | 6 December 2010 | 22nd |
| Valladolid | Javier Torres Gómez | End of tenure as caretaker | 6 December 2010 | Abel Resino | 6 December 2010 | 6th |
| Ponferradina | José Carlos Granero | Sacked | 4 January 2011 | Tomás Nistal (as caretaker) | 4 January 2011 | 20th |
| Ponferradina | Tomás Nistal | End of tenure as caretaker | 16 January 2011 | Claudio Barragán | 17 January 2011 | 21st |
| Tenerife | Juan Carlos Mandiá | Sacked | 23 January 2011 | Antonio Tapia | 24 January 2011 | 22nd |
| Albacete | Antonio Calderón | Sacked | 13 February 2011 | David Vidal | 13 February 2011 | 19th |
| Salamanca | Óscar Cano | Sacked | 14 February 2011 | Pepe Murcia | 15 February 2011 | 19th |
| Las Palmas | Paco Jémez | Sacked | 26 February 2011 | Juan Manuel Rodríguez | 26 February 2011 | 18th |
| Albacete | David Vidal | Sacked | 23 March 2011 | Mario Simón | 23 March 2011 | 21st |
| Tenerife | Antonio Tapia | Sacked | 5 April 2011 | David Amaral | 5 April 2011 | 21st |
| Salamanca | Pepe Murcia | Sacked | 11 April 2011 | Balta Sánchez | 11 April 2011 | 19th |
Question:
how many teams had an appointment date of 11 april 2011
Answer:
1.0