The UK will still have a higher rate than Ireland, which charges 12.5%.
For example, technical training degrees are likely to have a higher rate of return.
Doctors say organ transplants between relatives or people of the same ethnicity have a higher rate of success.
"If you increase production, and have more active mines," Mr. Burlacu said, "you have a higher rate of seismicity".
Minority patients have a higher rate of such results, she said.
But Belgians, Danes and others have a higher rate per person (see left-hand chart above).
The school district with low property taxes today would have a higher rate under a uniform state system.
As to why rape victims would have a higher rate of pregnancy, the Gottschalls put forward a few theories.
New York City is thought to have a higher rate than other major cities, but that, too, is something of a mystery.
Studies find that regions that produce well-educated high school graduates have a higher rate of business start-ups and more economic activity.
Texas health department figures show that the colonias have a higher rate of diseases such as hepatitis A, dysentery and cholera.
