Seventy-three percent of adults surveyed in 1984 said they were registered, and 71 percent in 1988.
Two-thirds of the adults surveyed complained that the economic crisis was dampening their libido.
Over all, just over 40 percent of the 1,500 adults surveyed said that they still needed additional services to help them recover.
In the poll, conducted Sept. 15 and 16, 66 percent of the 675 adults surveyed said they knew at least something about global warming.
A third of the 1,076 adults surveyed last week said they didn't care which team won.
On a 10-part quiz testing scientific understanding, only 27 percent of the American adults surveyed could answer seven or more questions.
That year, 54 percent of the 2,727 American adults surveyed said they had done some volunteer work.
Over all, 87.6 percent of the adults surveyed rated their health as good to excellent.
Only 32 percent of the 500 adults surveyed last month by InsightExpress, an online market research firm, said they read any magazine online.
The magazine reports that 59 percent of adults surveyed said they had lent money to friends.