In the long-form metadata to the data table, the source writes (citation » i):

1. TOELICHTING [...]
Wijzigingen per 20 februari 2017
[...] Door het wegvallen van financiering komen voor deze statistiek geen nieuwe gegevens meer beschikbaar vanaf 1 januari 2017. Voor meer informatie zie de link in paragraaf 3. [...]
Meer informatie over het wegvallen van de financiering voor deze statistiek is te lezen op de webpagina: Stand van zaken bezuinigingen bij CBS.

Translated:

1. EXPLANATORY STATEMENT [...]
Changes as of 20 February 2017
[...] Due to the loss of funding, no new data will be available for this statistic from 1 January 2017. For more information, see the link in section 3. [...]
More information about the loss of funding for these statistics can be found on the web page: State of business cuts at CBS.

This is a symptom of a more extensive reduction at the source (citation):

... funding cuts mean that Statistics Netherlands will discontinue 10% of non-mandatory statistics from 1 January 2017. This overview shows which statistics will be continued, and which will be discontinued.
Statistics for which no funding is available will be phased out in the course of 2016.

In response, we have marked the series as "discontinued" in their metadata and the catalog.

The series reside in the historical catalog (Netherlands » Consumer » Vehicle sales) and are:

• WRQSMVCMVUM.INLD = [DISCONTINUED] Vehicle sales - Commercial vehicles sold, (#, NSA)
• WRQSMVMCYUM.INLD = [DISCONTINUED] Motorbikes sold, (#, NSA)
• WRQSMVPAMUM.INLD = [DISCONTINUED]  Private cars sold, (#, NSA)

As a partial substitute, Data Buffet carries monthly data from ACEA, the European Automobile Manufacturers Association, regarding vehicle registrations in each EU country (see related article). The catalog (Netherlands » Sources: Multi-national » Industry » Vehicle registrations) contains, for example:

• CSQEARNPCUM.INLD = New registrations: Passenger cars, (#, NSA)

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a "find a catalog" mode that accepts a mnemonic.