The average debt for gas of those in arrears is now £320.
Law students, the study found, are leaving school with an average debt of $77,300, more than twice the sum they borrowed 10 years ago.
These students graduate with an average debt of over $27,000.
The average debt for most black farmers is $75,000 to $150,000.
The average debt has increased 58% since over the past seven years.
But students who borrow already graduate with an average debt of $22,700.
This year, Harvard graduates will have an average debt of $8,800, compared with $14,600 in 1998.
In 2003, the average debt of a medical student was nearly $110,000, double the figure in 1993.
More than half of America's college students take out education loans, with an average debt approaching $10,000.
In 1992, the average debt of a medical doctor after residency was $25,000.