When asked how her father has changed over the last eight years, Jenna Bush said: "He looks a little bit older, obviously. He's been under a lot of stress." It sure has been a stressful ride for Bush, and America, these last eight years. As President Bush has faced a major terrorist attack, two wars, and now a recession. Take a look at these photos, one for each year since 2000, to mark the major milestones of the 43rd presidency and to see how Bush has changed.