The standards are updated and revised as necessary every five years.

Such standards are constantly updated in light of community needs and technical advancements.

The standard was first published in June 1999 and was updated in 2005.

As standards change from year to year, the current standards will be updated here.

The standards were created in 1968 and thereafter updated in 2008.

The standards have been updated on a piecemeal basis, the report said, but they still fail to take into account many medical advances.

These standards were revised and updated in 1977, 1992, and 2001.

These standards, or dietary reference values, are periodically changed and updated as new scientific data become available.

The standards have existed since 2000 and were updated in 2007.

These original standards have not been substantially updated over the last 37 years to reflect newer scientific understanding of toxic effects.