Like all tax programs, they are updated annually, and only the current year's program can be used.

These were updated annually from 1978 to at least 1982.

Administrative data series go back to 1979 and are now updated annually.

The first version of this plan was for the period 1996-2000 and it is updated annually.

The plan was first published in December 2006 and will be updated annually.

A second edition was published in 2008 and is updated annually.

The database was developed in 2008, and will be updated annually.

The expert system had been updated annually since its creation.

The new system switches to market values and is to be updated annually.

Parts of the regulation may be updated annually on July 1.