Notes:

• As of the download (Mar.25/2023)
• Review the original introduction notes,
  not all districts span the whole year range: for example Uffington in Stamford,
  and not all districts contain all parishes: for example Grantham,
  etc.
• Not all entries contain a known year.
• Columns consisting of only question mark(s) are changed to null.
• Some transcribers used "[blank]" for missing data (changed to null)
  others used the bare word "blank" (not changed).
• No selected districts is the same as all selected.