Number of Published MEDLINE Abstracts per Year and the Percentage of Inaccessible URLs Accessed During the 30-day Period. The graph shows the number of MEDLINE abstracts published per year (blue line) against the percentage of inaccessible URLs per year of publication (red line). The availability of a URL is dependent on time after publication. A higher decay rate is seen in earlier articles.
Ducut et al. BMC Medical Informatics and Decision Making 2008 8:23 doi:10.1186/1472-6947-8-23