I have mentioned on several occasions in the past that retailer's sales ranking do not represent any real trends or superiority of one brand over another. I still find the latest data coming from Japan worth sharing here - Map Camera released their digital camera sales ranking for the month of July 2017 - I am actually surprised that there are four Nikon cameras mentioned in the list and only one Fuji and one Canon:
The Amazon US list of best selling interchangeable lens cameras can be found here.