After climbing steadily for six years, the number of Americans without health insurance dropped by more than a million in 2007, to 45.7 million, the Census Bureau has reported. The drop was largely because more people were covered through government programs. The number of uninsured, however, are higher today than they were at the outset of the Bush administration in 2001. That year, 39.8 million people, or 14.1%, were uninsured.