If this thread gets locked (= cencored) in 1 hour like the 2 previous threads that had this same info, it makes the objectivity of this site to look very questionable.
But, to the point:
Several sites have reported that SWITCH sold 12.8 million units in 2017.
This is according to IHS Markit, which is a company (3.8 billion revenue, 13 000 employees) that provides information and analysis to support the decision-making process of businesses and governments in industries such as financials markets; aerospace, defense and security; automotive; chemical; energy; maritime and trade; and technology. https://en.wikipedia.org/wiki/IHS_Markit
Seems pretty credible, and the most accurate info we have on this matter.
"The rumours of my death have been greatly exaggerated."
- Single-player Game