Frequently asked questions
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- What do the standard symbols used in the data tables mean?
.. not available for a specific reference period
... not applicable
- Who do I contact if I have a question?
Please access Contact us:
- How many agencies participated in this project?
Please access Agency identification. - How many years of data are in the time series?
This varies depending on the data. Generally the data includes 1990, 1995-2015. - How often are the data updated?
For most tables, the data are updated once a year as available.
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