sentences:  (The Big 12 was formed in 1996) Since that time, it was held in Kemper Arena in Kansas City, Missouri in early March for every year up until 2003, and also in 2005.In 2003, 2004, and 2006 it was held at the American Airlines Center in Dallas, Texas, and in 2007 it was held in the Ford Center at Oklahoma City, Oklahoma.In 2008 it was again held in Kansas City, but this time at the Sprint Center.