Of the estimated 60 percent of Americans eligible to give blood, only about 5 percent do so.

In 1876, about 82 percent of eligible Americans voted.

It would expand coverage to 94 percent of all eligible Americans.

Until recently, only 27 percent of eligible Americans had passports.

Seventy-five million eligible Americans are not registered to vote.

The number of Americans eligible to donate blood is not known, but health officials estimate that 5 percent of them actually do so.

There has been a pronounced decline in the percentage of eligible Americans who are registered to vote, a research group reports.

Nationally, the percentage of eligible Americans who are registered is estimated to be 70.9 percent, down 2.2 points from the 1984 level.

And the largest number of eligible Americans in history opted not to vote, estimated at 119.45 million.

Despite efforts to increase uptake, an estimated 15 million eligible Americans are still not using the program.