In a direct communication, the source (Bank of Latvia) explained:

Due to very small amounts in transactions with USD and small number of data reporters which can lead to a confidentiality of statistical data it was decided to cease the publication of those data.

In response, we have:

1. Archived the series (as early as 2004m1 to as late as 2012m12) by marking them as "discontinued" in their metadata.
2. Segregated in the catalog.

The series reside in the historical catalog:

• Latvia » Financial » Interest rates » Lending rates » Loans in USD [DISCONTINUED]

and include, for example:

• IR%LNHH$UM.ILVA    = [DISCONTINUED] Interest Rates: Loans in $ to Households for House Purchases, (% per annum, NSA)
• IR%LNHCR$UM.ILVA   = [DISCONTINUED] Consumer credit, (% per annum, NSA)
• IR%LNNFRLO$UM.ILVA = [DISCONTINUED] Loans in Lats - Non-Financial Corporations: Revolving Loans and Overdraft, (%, NSA)