By the late 1950s, 59 percent of the population knew how to read and write.

Today 90 percent of people with the virus don't know it.

Only 25 percent knew that other members' deposits were used.

Until two years ago he was the only president 65 percent of the population had ever known.

"Only about 10 percent of the people know what is going on."

Believe it or not, 80 percent of them don't know how to get where they are going.

Of those 573 men, 77 percent did not know that they were infected.

Only 5 percent of the students know enough English to read their textbooks.

The remaining 27 percent either did not know or refused to answer.