Moody's Rating
August 2011 AA2 Affirmation
May 2010 - AA2 Recalibration
April 2010 - A1 Affirmation
January 2005 - A1 Affirmation
November 2001 - A1 Upgrade
Standard & Poor's
August 2011 - AA Affirmation, Stable
May 2010 - AA Upgrade, Stable
January 2005 - AA- Upgrade, Stable
November 2001- A+ Initial Rating