An official website of the United States government
Here is how you know
The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information,
make sure you're on a federal government site.
The site is secure.
https:// ensures that you are connecting to the official website and that any
information you provide is encrypted and transmitted securely.
Patricia S. Wilder
Recent declines have beset an industry in which productivity has grown rapidly since 1958; gains have been associated with more efficient plants, improved technology, and an expanding line of products which serve changing markets.