Between 1993 and 2006, the average cost of academic journals has almost tripled while the Belgian consumer price index increased by only 29.56% during the same period.
This average is based on 70,000 journal titles and includes titles published by commercial publishers as well as by academic and scientific societies whose price policy is often more reasonable. This price explosion affects the exact and medical sciences. But human sciences are far from being spared since the average price of journals has more than doubled over the same period.
Based on Swets data
More information: Webbibliography - Economic aspects