The federal government is a great source for all sorts of national statistics; getting world statistics can be more challenging. Check out the Guide to U.S.Government Statistics (below) that contains both!
What is Provenance?
The online collections below might lead you to a useful primary source. Once you have found what looks like an interesting collection, what is your next step? According to Richard Pearce-Moses of the Society of American Archivists, researchers "will look critically at where the information comes from. They want to be confident that the sources they have found e.g. scanned images, are reliable and represent an accurate depiction of the original document. Determining the origin or source of an item is referred to as “provenance.” The Society of American Archivists defines provenance as the “information regarding the origins, custody, and ownership of an item or collection.”1