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:
| Season | Club | Country | Championship | National Cup | International Cup |
| --- | --- | --- | --- | --- | --- |
| 2006–2007 | CA Bizerte | Tunisian Ligue | ? app / 0 goals | – app / – goal | – app / – goal |
| 2007–2008 | CA Bizerte | Tunisian Ligue | ? app / 7 goals | – app / – goal | – app / – goal |
| 2007–2008 | Espérance Tunis | Tunisian Ligue | 8 app / 1 goals | – app / – goal | – app / – goal |
| 2008–2009 | Espérance Tunis | Tunisian Ligue | 21 app / 6 goals | – app / – goal | – app / – goal |
| 2009–2010 | Espérance Tunis | Tunisian Ligue | 11 app / 6 goals | – app / – goal | – app / – goal |
| 2009–2010 | BSC Young Boys | Swiss Super League | 15 app / 5 goals | – app / – goal | – app / – goal |
| 2010–2011 | BSC Young Boys | Swiss Super League | 34 app / 16 goals | 3 app / 3 goal | 10 app / 3 goals |
| 2011–2012 | BSC Young Boys | Swiss Super League | 6 app / 0 goals | – app / – goal | 4 app / 1 goals |
| 2011–2012 | Fenerbahçe | Süper Lig | 36 app / 8 goals | 3 app / 4 goals | – app / – goal |
| 2012–2013 | Fenerbahçe | Süper Lig | 2 app / 0 goals | 0 app / 0 goals | 3 app / 0 goal |
Question:
What is the national cup statistics when the Championship is 21 app / 6 goals?
Answer:
– app / – goal