To cater for a wider audience , a new round , an aptitude test , was introduced .
Participation again increased ; to more than 11,000 in 2003 , 13,000 in 2004 and 15,000 in 2005 .
To cater for a wider audience , a new round , an aptitude test , was introduced and participation again increased ; to more than 11,000 in 2003 , 13,000 in 2004 and 15,000 in 2005 .