That debt totals some $4.3 billion and is to be paid back at the rate of about $500 million a year.
Sources suggested debts now total £240m though some experts believe that figure could be significantly higher.
The company's outstanding debt totals $223 million, with more than 85 percent due after 1995.
The Mexican government itself also has big foreign debts, totaling $76 billion.
At the end of last year, its foreign debt totaled $82.9 billion, the institute estimates.
To finance that, it has had to borrow, and its debts now total $3.8 billion.
Texas Air's long-term debt and lease obligations total $4.9 billion.
Among graduate students, average debt totaled roughly $42,000 in 2004.
Tyson's filing says his debt totals more than $27 million.
According to the latest official figures, China's debts totaled $40 billion at the end of 1988.