Frequently asked questions

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