* No comparison with other time periods, and their respective tuition fees.

* No comparison with other countries, and their respective policies.

* No data on where these students graduate from, or in which subjects, or with which grades, or what their average salary is X years later, or whether they'll actually be able to pay back the loan.

It's missing a huge amount of important information; you really can't justify the conclusion "tuition fees are good" from this alone.