Scopus Journal Analyzer does not have complete citation information for articles published prior to 1996.
Four years of data are necessary to calculate a SJR or SNIP. Because Scopus records data starting in 1996, the first year available for a SJR or SNIP is 1999.
The Journal Analyzer provides a view of journal performance using Scopus citation data and includes two new journal metrics - SJR and SNIP.
Using citations from nearly 18,000 titles from 5,000 international publishers, the Journal Analyzer goes back to 1996.
Journal Analyzer is accessible via Scopus from Elsevier (requires subsription).
SJR and SNIP are freely accessible.
Scopus Journal Analyzer will chart:
You can compare up to 10 journals.