Journal Citation Reports® is published annually in two editions. Only the editions and years that your institution subscribes to appear on the home page.
JCR Science Edition contains data from over 7,300 journals in science and technology.
JCR Social Sciences Edition contains data from over 2,200 journals in the social sciences.
The year that you select is the JCR year. All of the data that you see for journals and subject categories come from journal data published in that year. For example, if you select JCR Science Edition 2006, and you search for a particular journal, you will see the 2006 data for that journal, including:
Number of articles published in the journal in 2006
Number of citations to that journal from articles published in 2006
Impact Factor calculated from 2006 data, and so on