When was Diamondback built?

Diamondback came out on April 18, 2009.  Diamondback is Bolliger and Mabillard Hypercoaster.  Diamonback is 230ft tall with a 215ft drop.  Diamondback is 5,282 feet long and 80mph.  Diamondback has a max vertical of 74 degrees.

http://en.wikipedia.org/wiki/Diamondback_(roller_coaster)