Some are provided by governments, some by colleges and universities, and others by commercial entities. Statistics may be current figures, show change over time, represent social or political trends, or refer to specific populations. The references contained in this guide are just a sample of the sources available here or online. Most sources have good introductions, or online help to assist you in interpreting any tables.
Librarians are available to provide able assistance.
This website is under continuous update. If you have a useful source to share, please send in your contribution.