Question: What is the capacity of the stadium at which the 2009–10 RBS Twenty-20 Cup was held?

Context paragraphs:
Anis Siddiqi: Anis Siddiqi (born 11 April 1959) is a Pakistani former first-class cricketer who played for Lahore cricket team.  He later became a umpire and stood in a match in the 2008–09 RBS Twenty-20 Cup.

2008–09 RBS Twenty-20 Cup: The 2008–09 RBS Twenty-20 Cup was the fourth edition of the RBS Twenty-20 Cup, a domestic Twenty20 tournament in Pakistan.  It was held in Lahore from 4 to 8 October 2008.  The Sialkot Stallions won their third overall and consecutive title by defeating the Karachi Dolphins in the final.  As the winners, the Stallions qualified for the 2008 Champions League Twenty20, which was later cancelled.

2009 RBS Twenty-20 Cup: The 2009 RBS Twenty-20 Cup was the fifth edition of the RBS Twenty-20 Cup, a domestic Twenty20 tournament in Pakistan.  It was held in Lahore from 25 to 29 May 2009.  The Sialkot Stallions won their fourth overall and consecutive title by defeating the Lahore Lions in the final.

Anis-ur-Rehman: Anis-ur-Rehman (born 4 September 1970) is a Pakistani former first-class cricketer who played for Sargodha cricket team.  He was also an umpire and stood in matches in the 2009 RBS Twenty-20 Cup.

2009–10 RBS Twenty-20 Cup: The 2009–10 RBS Twenty-20 Cup was the sixth edition of the domestic RBS Twenty-20 Cup in Pakistan, sponsored by the Royal Bank of Scotland.  It was held from 28 February to 7 March 2010 at the National Stadium, Karachi.  This edition had 13 competing teams divided into four groups.  Sialkot Stallions successfully defended the title and won the tournament for the fifth consecutive time, defeating Faisalabad Wolves in the final by 5 wickets.

Ijaz Ahmed (cricketer, born 1957): Ijaz Ahmed (born 19 September 1957) is a Pakistani former first-class cricketer who played for Lahore cricket team.  Later he was an umpire and stood in matches in the 2008–09 RBS Twenty-20 Cup.

2005–06 ABN-AMRO Twenty-20 Cup: The 2005–06 ABN-AMRO Twenty-20 Cup was the second edition of the ABN-AMRO Twenty-20 Cup, a domestic Twenty20 competition in Pakistan.  It was held in Karachi from 24 February to 4 March 2006.  This edition featured an expanded format, with an increase from 19 to 39 matches and from 11 to 13 teams; the new teams being the Islamabad Leopards and the Abbottabad Rhinos.  The Sialkot Stallions won by defeating the defending champions the Faisalabad Wolves in the final.

Sialkot cricket team: The Sialkot cricket team in Pakistan is also known as the Sialkot Stallions.  Its home ground is Jinnah Stadium Sialkot.  It plays in first-class domestic competitions.  It is a National Champion and has won several Quaid-i-Azam Trophy competitions including 2008-2009.  It was national champion in 2005–2006 and won Quaid-i-Azam Trophy Championship (Golden League) .  It was runner-up in 2003–2004 and 2006–2007.  Sialkot Stallions also won ABN-AMRO Twenty-20 Cup in 2005–2006, 2006–2007 and RBS Twenty-20 Cup in 2007–2008 and 2009–2010, making them the National Twenty20 Champions for 4 consecutive years .  Sialkot Stallions were to represent Pakistan in Twenty20 Champions League in December 2008, before its postponement.  They were runner-up in ABN-AMRO Cup National One-day Championship in 2004–05 and 2006–07.

National Stadium, Karachi: The National Stadium (Urdu: نیشنل اسٹڈیم‎ ) is a cricket stadium in Karachi, Pakistan.  It is currently used for cricket matches, it is the home ground of Karachi Kings, Pakistan Super League second expensive team and is home to many other Karachi's domestic cricket teams.  The stadium is able to hold 34,228 spectators, Its widely criticised that the city of this size with a population of over 15 million having such a small capacity stadium.  In the recent past, PCB has announced on different occasions that the capacity of the stadium will be increased to 90,000 but this approval looks a bit stale at the moment.

2004–05 ABN-AMRO Twenty20 Cup: The 2004–05 ABN-AMRO Twenty-20 Cup was the first edition of the ABN-AMRO Twenty-20 Cup, a domestic Twenty20 tournament in Pakistan.  It was held from 25 to 30 April 2005 in Lahore.  The Faisalabad Wolves won the tournament by defeating the Karachi Dolphins in the final.  As the winners, the Faisalabad Wolves were invited to compete in the in September 2005, which they won.

Supporting paragraphs: 2009–10 RBS Twenty-20 Cup National Stadium, Karachi
Answer: 34,228