But that 20% is growing, and the amount of newspaper digitization projects are growing also. Whether they be commercial subscription sites, state wide projects, or small library digitization projects for just one newspaper, they all add up.
Here is a list of new digitization efforts that are either in progress or are recently completed. The link will take you to an article that describes in more detail the status of the project.
California - Old Monterey newspapers from 1846-1930 now available online
California - Back issues of Star now digitized
Colorado - Library adds Salida Record to archive
Georgia - Thronateeska archives get Daughters of American Revolution grant
Indiana - Archives now on history website
Indiana - Changes, versatility keep Warren library viable as it hails centennial
Indiana - Library adds more newspaper editions online
Maryland - Agencies awarded funds to preserve history, the arts
Maryland - Newspaper digitization complete, will be accessible online soon
Massachusetts - Old newspapers now digitized at library
Minnesota - Labor Review archive faster, easier to use
Missouri - Shelbina library digitizing contents from eight turn-of-the-century newspapers
Missouri - Herald's Online Digital Archive Collection Is Growing
Missouri - Herald set to release its archives dating to 1880s
New York - Vintage Staten Island newspapers now available online
New York - Library council approves grants for six historical collections
North Carolina - The Chronicle Digital Collection (1905-1989) Is Complete!
Texas - Smith County Historical Society gets spruced up, newspaper archives organized thanks to Eagle Scout project
Virginia - SIX MOMENTS IN UVA HISTORY, AS DOCUMENTED BY NEWLY EXPANDED DIGITAL ARCHIVE
West Virginia - Preserving history: Library upgrade is welcomed
Wisconsin - Elm Grove Library offers digital newspaper collection
Hopefully the paper or location is in the area of your research!
I'm sure there are more projects underway - these are just some that have written articles about them.
If you know of more - please let us know in the comments.