By 70, the prevalence of complete impotence tripled to 15 percent.

However, the report noted, the four now have a share of world trade that has tripled to 7.4 percent since 1970.

In all, the state's forest cover has more than tripled in this century, from 20 percent 100 years ago to 62 percent today.

Between 1999 and 2009, return on capital nearly tripled to 7 percent.

The trend is similar among children: according to the surgeon general, the percentage of obese youths has tripled, to nearly 15 percent, since the 1960's.

By contrast, Mobic has roughly tripled its share of new prescriptions, to 17 percent.

The number of applicants who fail English tests has nearly tripled since 1989, to 34.6 percent, the commission says.

Since 1979, the number of shareholders in Britain has tripled to nine million, or about 20 percent of the adult population.

First National's share of consumer deposits nearly tripled, to 40 percent.

Over all, the weak dollar was enough to triple to 15.64 percent the average return in the 10 markets outside the United States.