The field increased to 40 in 1996 , increased to 69 by the year of 2000 .
The field stabilized at 64 after 2001 which it remained at until 2012 .
The field increased to 40 in 1996 , increased to 69 by the year of 2000 , and stabilized at 64 after 2001 which it remained at until 2012 .