PubMed by Year shows your search proportionally, comparing the results for each year to the database as whole.
Enter any PubMed search above to see how your results change over time. You can use one word (e.g. heart, diabetes) or several (breast cancer, myocardial infarction). You can even use more advanced techniques such as field tags (Leukemia[Mesh], pubmednotmedline [sb]) or boolean operators (smoking AND lung cancer, polio AND (vaccine OR vaccination)). Finally, by entering multiple searches one at a time, you can easily compare them. Once you're finished, you can easily share your results with others or save your graphs for later. (more)