The share of Americans identifying themselves as "extremely proud" to hail from the United States is waning, according to a Gallup poll released Thursday.

The survey demonstrates that 54 percent of U.S. adults describe themselves as "extremely proud" to be American, a figure that stood at a height of 70 percent in 2003 in the wake of the 9/11 terror attacks when George W. Bush was president.

In fact, this year marks the figure's lowest point since before 2001, the year when Gallup began asking the question annually.

Still, the percentage of Americans calling themselves "extremely proud" dwarfs those who identify as otherwise. Twenty-seven percent label themselves "very proud," 14 percent "moderately proud," 4 percent "only a little proud," and a paltry 1 percent "not at all proud."

When divided by political ideologies, Americans who call themselves Republicans are evidently most proud of their American heritage, as 68 percent deem themselves "extremely proud." Among Democrats, that figure shrinks to 47 percent.

And Millennial Americans are less proud to be American than their older counterparts, with 43 percent of 18-to-29 year olds calling themselves "extremely proud." The figure is at minimum nine percentage points higher for older age groups.

The survey was conducted between June 2 and 7 involved 1,527 U.S. adults.