in 2006 they got 13,000 for two ODIs. Which is the same capacity the basin reserve can hold.
Attendance is usually around this mark or less with three exceptions: vs India 19,000 (2003), vs England 25,000 (2002) and vs Australia 20,000 (2005).
Am excluding the novelty factor of the first year of the stadium.
So they've basically built the stadium in an oval shape for 3 games of cricket (and the World Cup) in a 15 year span. I blame them.