Yearly trends in PubMed (Medline) indexing by
country of publication
absolute numbers
The scale on the right is for papers published yearly in journals havin the Medline 'PL' (place of publication) as 'United States' or 'England'; the scale on the left is for papers published in journals located in other countries. "sco" means Scotland.
Some journals do not have a 'PL' field.
