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:
| No. | Name | Place of Birth | Date of Birth | Previous Club | Date Joined | Fee | Contract Expiry |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Ben Williams | Manchester | 27 August 1982 | Carlisle United | 10 July 2009 | £60,000 | May 2012 |
| 2.0 | Conor Powell | Dublin | 26 August 1987 | Bohemians | 6 January 2011 | Free | May 2011 * |
| 3.0 | Lee Beevers | Doncaster | 4 December 1983 | Lincoln City | 29 June 2009 | Free | May 2011 * |
| 4.0 | Magnus Okuonghae | Croydon | 16 February 1986 | Dagenham & Redbridge | 1 July 2009 | £65,000 | May 2012 |
| 5.0 | Pat Baldwin | London | 12 November 1982 | Chelsea | 31 August 2002 | Free | May 2012 |
| 7.0 | Ashley Vincent | Birmingham | 26 May 1985 | Cheltenham Town | 1 July 2009 | Free | May 2012 |
| 8.0 | John-Joe O'Toole | Harrow | 30 September 1988 | Watford | 1 January 2010 | £275,000 | May 2012 |
| 10.0 | Kemal Izzet | Whitechapel | 29 September 1980 | Charlton Athletic | 13 April 2001 | Free | May 2012 |
| 11.0 | Simon Hackney | Manchester | 5 February 1984 | Carlisle United | 26 January 2009 | £100,000 | May 2011 * |
| 12.0 | Mark Cousins | Chelmsford | 9 January 1987 | Youth Team | 1 July 2004 | Free | May 2011 |
| 14.0 | Andrew Bond | Wigan | 16 March 1986 | Barrow | 18 July 2010 | Free | May 2012 |
| 15.0 | Kayode Odejayi | Ibadan | 21 February 1982 | Barnsley | 1 January 2010 | Undisclosed | May 2012 |
| 16.0 | Ian Henderson | Thetford | 24 January 1985 | Ankaragücü | 6 January 2010 | Free | May 2011 |
| 17.0 | David Perkins | Heysham | 21 June 1982 | Rochdale | 8 July 2008 | £150,000 | May 2011 |
| 18.0 | Steven Gillespie | Liverpool | 4 June 1985 | Cheltenham Town | 7 July 2008 | £400,000 | May 2011 |
| 20.0 | Brian Wilson | Manchester | 9 May 1983 | Bristol City | 15 July 2010 | Free | Unknown |
| 21.0 | Medy Elito | Kinshasa | 20 March 1990 | Youth Team | 1 July 2007 | Free | May 2011 * |
| 22.0 | Anthony Wordsworth | Camden | 3 January 1989 | Youth Team | 1 July 2006 | Free | May 2013 |
| 24.0 | Ben Coker | Kettering | 1 July 1990 | Bury Town | 23 July 2010 | Free | May 2012 |
| 25.0 | John White | Colchester | 26 July 1986 | Youth Team | 1 July 2003 | Free | May 2011 |
| 26.0 | Lloyd James | Bristol | 16 February 1988 | Southampton | 22 July 2010 | Free | Unknown |
| 28.0 | Matt Heath | Leicester | 1 November 1981 | Leeds United | 13 May 2008 | Free | May 2012 |
| 30.0 | Morten Knudsen | Notodden | 27 October 1986 | Notodden FK | 19 January 2010 | Free | May 2011 * |
| 32.0 | Sam Corcoran | Enfield | 5 February 1991 | Youth Team | 1 July 2008 | Free | May 2011 * |
| 33.0 | Jordan Sanderson | London | 7 August 1993 | Youth Team | 11 February 2011 | Free | May 2012 |
| 34.0 | Thomas Bender | Harlow | 19 January 1993 | Youth Team | 1 July 2009 | Free | May 2012 |
Question:
how many date of birts are if the previous club is chelsea
Answer:
1.0