How does one use the aggregate values?

[Deleetdk]

Some tables have aggregate versions of some identifiers. For instance, FOLK2:

http://www.statistikbanken.dk/statbank5a/SelectVarVal/Define.asp?MainTable=FOLK2&PLanguage=1&PXSId=0&wsid=cftree

By default, it uses single years, but one can select 5 or 10 year aggregates in the menu. These options do not seem to be available using the API.

I looked in the network tool in Firefox. Switching between these does not change the URL, but it does send a POST form request. In this, there is a field called grouping1:

grouping1 = "" -- single years
grouping1 = "20063915132215154453" -- 10 year groups
grouping1 = "20063915451515155172" -- 5 year groups

Trying anyway gives an error:

> dkstat::dst_get_data("FOLK2", lang = "en",
+                      query = list(IELAND = "Denmark",
+                                   ALDER = "0-4 years"
+                      )
+ )
Error in dst_find_val_id(meta_data = meta_data, variable = names(query)[i],  : 
  All the values_text could not be matched in the text field of the values column of ALDER. It might be a typo or maybe the value isn't present in the variable.

It seems that we need some kind of way to access these data.